diff --git a/configure/CONFIG.gnuCommon b/configure/CONFIG.gnuCommon
index a6305990b..63a32eca1 100644
--- a/configure/CONFIG.gnuCommon
+++ b/configure/CONFIG.gnuCommon
@@ -65,7 +65,7 @@ LOADABLE_SHRLIB_LDFLAGS = -shared -fPIC -Wl,-h$@
 
 GNU_LDLIBS_YES = -lgcc
 
-# Use compiler flags to generate header dependancies files
+# Use compiler flags to generate header dependencies files
 HDEPENDS_METHOD = COMP
 HDEPENDS_COMPFLAGS = -MM -MF $@
 
diff --git a/configure/CONFIG_ADDONS b/configure/CONFIG_ADDONS
index d32d91165..5b581f48c 100644
--- a/configure/CONFIG_ADDONS
+++ b/configure/CONFIG_ADDONS
@@ -24,7 +24,7 @@
 #    These rules apply to these Makefile-variables:
 #    USR_CFLAGS    C flags
 #    USR_CXXFLAGS  C++ flags
-#    USR_CPPFLAGS  c preprocesser flags
+#    USR_CPPFLAGS  c preprocessor flags
 #    SRCS          source files for building libraries and prods
 #    USR_SRCS      source files for building libraries and prods
 #    PROD_SRCS     source files for building prods
diff --git a/configure/CONFIG_COMMON b/configure/CONFIG_COMMON
index 9165ae294..c37b47238 100644
--- a/configure/CONFIG_COMMON
+++ b/configure/CONFIG_COMMON
@@ -147,7 +147,7 @@ CMPLR_SRC_DIRS += . $(foreach dir, .. $(SRC_DIRS), \
 ALL_SRC_DIRS = $(CMPLR_SRC_DIRS) $(OS_SRC_DIRS) $(GENERIC_SRC_DIRS)
 
 #--------------------------------------------------
-# Directory for OS independant build created files
+# Directory for OS independent build created files
 COMMON_DIR = ../O.Common
 
 # compile line include directories
diff --git a/configure/RULES.Db b/configure/RULES.Db
index 4a984f8c3..ae023cee1 100644
--- a/configure/RULES.Db
+++ b/configure/RULES.Db
@@ -55,7 +55,7 @@ DBD += $(foreach type, $(CROSS_TARGET_OS_TYPES), $(DBD_$(type)))
 # DBD_solaris += abcSolaris.dbd
 #
 # ---------------------------------------------------
-# DBD concatination files
+# DBD concatenation files
 
 COMMON_DBDCATS += $(addprefix $(COMMON_DIR)/,$(DBDCAT))
 DBDCAT_SOURCES += $(foreach file, $($*_DBD), $(DBDCAT_SOURCE) )
@@ -194,7 +194,7 @@ ifneq (,$(strip $(DBDDEPENDS_FILES)))
 endif
 
 #---------------------------------------------------------------
-# build dependancies, clean rule
+# build dependencies, clean rule
 
 inc: $(COMMON_INC) $(INSTALL_INC) $(COMMON_DBDS) $(COMMON_DBDCATS) \
 	$(INSTALL_DBDS) $(INSTALL_DBD_INSTALLS) $(COMMON_DOCS)
diff --git a/configure/RULES_ARCHS b/configure/RULES_ARCHS
index 4aaa75870..0d4d944d4 100644
--- a/configure/RULES_ARCHS
+++ b/configure/RULES_ARCHS
@@ -32,7 +32,7 @@ ifneq ($(RELEASE_CFG_DIR_RULES),)
   include $(RELEASE_CFG_DIR_RULES)
 endif
 
-# Create EPICS_HOST_ARCH dependancies for GNU make -j option.
+# Create EPICS_HOST_ARCH dependencies for GNU make -j option.
 # Needed in dirs where EPICS_HOST_ARCH build creates a tool used in 
 # cross arch builds
 
diff --git a/configure/RULES_DIRS b/configure/RULES_DIRS
index f47df4a53..6314c530f 100644
--- a/configure/RULES_DIRS
+++ b/configure/RULES_DIRS
@@ -44,7 +44,7 @@ $(foreach dir, $(DIRS), $(dir)$(DIVIDER)install): \
 rebuild: $(foreach dir, $(DIRS), $(dir)$(DIVIDER)install)
 endif
 
-# Create directory dependancies lines for GNU make -j option
+# Create directory dependencies lines for GNU make -j option
 # Only works with GNU make 3.81 or later (uses eval function)
 define DEP_template1
 $(1): $$($(1)_DEPEND_DIRS)
diff --git a/configure/Sample.Makefile b/configure/Sample.Makefile
index e0e9675bf..0c0b313e2 100644
--- a/configure/Sample.Makefile
+++ b/configure/Sample.Makefile
@@ -82,7 +82,7 @@ INC         = file.h
 #	Platform specific files can also be put in
 #	separate os/OS_CLASS directories!
 #
-#	For almost every file the seach order is:
+#	For almost every file the search order is:
 #	./os/OS_CLASS
 #	./os/generic
 #	.
@@ -136,11 +136,11 @@ PROD_SRCS = ppp.c qqq.c
 a_file_SRCS = aa.c bb.c
 
 #
-#	EPICS libs needed to link PROD, TESTPROD and sharable library
+#	EPICS libs needed to link PROD, TESTPROD and shareable library
 #
 #	note that DLL_LIBS (the libraries needed to link a shareable
 #	library) is created by default from the PROD/SYS libraries specified 
-#	below minus the name of the sharable library (LIBRARY)
+#	below minus the name of the shareable library (LIBRARY)
 #	
 #
 # ----------  libraries for a specific product pppp
@@ -169,7 +169,7 @@ USR_LIBS_DEFAULT = foolib
 USR_LIBS_WIN32   = -nil-
 foolib_DIR = $(FOO_LIB)
 
-#	system libs needed to link PROD, TESTPROD and sharable library
+#	system libs needed to link PROD, TESTPROD and shareable library
 #
 # ---------- system libraries for all products
 # for all systems:
diff --git a/configure/os/CONFIG.win32-x86.win32-x86 b/configure/os/CONFIG.win32-x86.win32-x86
index d45a48041..abf552ba9 100644
--- a/configure/os/CONFIG.win32-x86.win32-x86
+++ b/configure/os/CONFIG.win32-x86.win32-x86
@@ -222,7 +222,7 @@ INSTALL_SHRLIB = $(INSTALL_BIN)
 
 
 #--------------------------------------------------
-# Products dependancy definitions
+# Products dependency definitions
 
 PROD_DEPLIBS = $(foreach lib, $(PROD_LIBS) $(USR_LIBS), \
   $(firstword $(wildcard \
@@ -247,10 +247,10 @@ PROD_LDLIBS += $(STATIC_LDLIBS) \
       $(LDLIBS_SHARED_$(SHARED_LIBRARIES))))
 
 #--------------------------------------------------
-# Libraries dependancy definitions
+# Libraries dependency definitions
 
 #   libs that we need to link the DLL with
-#   (it isnt necessary to rebuild the dll if these change)
+#   (it isn't necessary to rebuild the dll if these change)
 
 SHRLIB_DEPLIBS = $(foreach lib, $(LIB_LIBS) $(USR_LIBS), \
   $(firstword $(wildcard \
diff --git a/configure/os/CONFIG_SITE.linux-x86.linux-x86 b/configure/os/CONFIG_SITE.linux-x86.linux-x86
index 64810a835..ee7484e04 100644
--- a/configure/os/CONFIG_SITE.linux-x86.linux-x86
+++ b/configure/os/CONFIG_SITE.linux-x86.linux-x86
@@ -3,7 +3,7 @@
 # Site specific definitions for linux-x86 host - linux-x86 target builds
 #-------------------------------------------------------
 
-# Uncomment the followings lines to build with CLANG instead of GCC.
+# Uncomment the following lines to build with CLANG instead of GCC.
 #
 #GNU         = NO
 #CMPLR_CLASS = clang
diff --git a/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64 b/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64
index 2f538151a..bdedf4f2c 100644
--- a/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64
+++ b/configure/os/CONFIG_SITE.linux-x86_64.linux-x86_64
@@ -3,7 +3,7 @@
 # Site specific definitions for linux-x86_64 host - linux-x86_64 target builds
 #-------------------------------------------------------
 
-# Uncomment the followings lines to build with CLANG instead of GCC.
+# Uncomment the following lines to build with CLANG instead of GCC.
 #
 #GNU         = NO
 #CMPLR_CLASS = clang
diff --git a/documentation/Doxyfile@ b/documentation/Doxyfile@
index 2c0289602..ef2377119 100644
--- a/documentation/Doxyfile@
+++ b/documentation/Doxyfile@
@@ -1105,7 +1105,7 @@ HTML_STYLESHEET        =
 # cascading style sheets that are included after the standard style sheets
 # created by doxygen. Using this option one can overrule certain style aspects.
 # This is preferred over using HTML_STYLESHEET since it does not replace the
-# standard style sheet and is therefor more robust against future updates.
+# standard style sheet and is therefore more robust against future updates.
 # Doxygen will copy the style sheet files to the output directory.
 # Note: The order of the extra stylesheet files is of importance (e.g. the last
 # stylesheet in the list overrules the setting of the previous ones in the
@@ -1648,8 +1648,8 @@ EXTRA_PACKAGES         =
 # Note: Only use a user-defined header if you know what you are doing! The
 # following commands have a special meaning inside the header: $title,
 # $datetime, $date, $doxygenversion, $projectname, $projectnumber,
-# $projectbrief, $projectlogo. Doxygen will replace $title with the empy string,
-# for the replacement values of the other commands the user is refered to
+# $projectbrief, $projectlogo. Doxygen will replace $title with the empty string,
+# for the replacement values of the other commands the user is referred to
 # HTML_HEADER.
 # This tag requires that the tag GENERATE_LATEX is set to YES.
 
diff --git a/documentation/RELEASE-3.15.md b/documentation/RELEASE-3.15.md
index c304a461b..aa31805ee 100644
--- a/documentation/RELEASE-3.15.md
+++ b/documentation/RELEASE-3.15.md
@@ -191,7 +191,7 @@ parameter with one called `EPICS_TZ` and a routine for VxWorks that calculates
 the `TIMEZONE` environment variable from the current `TZ` value. This routine
 will be run once at start-up, when the EPICS clock has synchronized to its NTP
 server. The calculations it contains were worked out and donated to EPICS by
-Larry Hoff in 2009; it is unforunate that it has taken 10 years for them to be
+Larry Hoff in 2009; it is unfortunate that it has taken 10 years for them to be
 integrated into Base.
 
 The default value for the `EPICS_TZ` environment parameter is set in the Base
@@ -521,7 +521,7 @@ a Windows system and an IOC or PCAS server is started, the IOC's attempt to
 bind a TCP socket to the CA server port number fails, but Windows returns a
 different error status value than the IOC is expecting in that circumstance
 (because the National Instruments code requests exclusive use of that port,
-unlike the EPICS code) so the IOC fails to start properly. The relevent EPICS
+unlike the EPICS code) so the IOC fails to start properly. The relevant EPICS
 bind() checks have now been updated so the IOC will request that a dynamic port
 number be allocated for this TCP socket instead when this happens.
 
@@ -619,7 +619,7 @@ static versions of the compiler support libraries have now been moved into the
 The `iocInit` code now performs a sanity check of the current time
 returned by the generalTime subsystem and will print a warning if the wall-clock
 time returned has not been initialized yet. This is just a warning message; when
-a time provider does synchonize the IOC will subsequently pick up and use the
+a time provider does synchronize the IOC will subsequently pick up and use the
 correct time. This check code also primes the registered event system provider
 if there is one so the `epicsTimeGetEventInt()` routine will work on IOCs
 that ask for event time within an interrupt service routine.
@@ -642,7 +642,7 @@ change will not cause the IOC to see time going backwards.
 ### Microsoft Visual Studio builds
 
 The build configuration files for builds using the Microsoft compilers have been
-updated, although there should be no noticable difference at most sites. One
+updated, although there should be no noticeable difference at most sites. One
 extra compiler warning is now being suppressed for C++ code, `C4344: behavior
 change: use of explicit template arguments results in ...` which is gratuitous
 and was appearing frequently in builds of the EPICS V4 modules.
diff --git a/documentation/RELEASE-3.16.md b/documentation/RELEASE-3.16.md
index 32656ba5d..5f9602ca3 100644
--- a/documentation/RELEASE-3.16.md
+++ b/documentation/RELEASE-3.16.md
@@ -661,7 +661,7 @@ the `DB_OPT` build configuration variable.
 
 The compressRecord has a new field `BALG` which can select between FIFO
 (append) and LIFO (prepend) ordering for insertion of new elements. FIFO
-ordering is the default, matching the behviour of previous versions.
+ordering is the default, matching the behaviour of previous versions.
 
 ### Valgrind Instrumentation
 
diff --git a/documentation/RELEASE-7.0.1.1.md b/documentation/RELEASE-7.0.1.1.md
index ee61fdcf9..3e0bbd467 100644
--- a/documentation/RELEASE-7.0.1.1.md
+++ b/documentation/RELEASE-7.0.1.1.md
@@ -59,7 +59,7 @@ been split into 4 separate Git repositories. External modules should build
 against this new structure with little or no changes needed, except that some
 allowance may be needed for the merging of the V4 modules.
 
-There should be rather more description and documantation of these changes
+There should be rather more description and documentation of these changes
 than is currently available, but as developers we generally much prefer to
 write code than documentation. Send questions to the tech-talk mailing list
 and we'll be happy to try and answer them!
diff --git a/documentation/RELEASE-7.0.3.1.md b/documentation/RELEASE-7.0.3.1.md
index 3f1180243..ed1998f72 100644
--- a/documentation/RELEASE-7.0.3.1.md
+++ b/documentation/RELEASE-7.0.3.1.md
@@ -56,7 +56,7 @@ A suggested form for IOC shell commands is:
 
 ### Relocatable Builds
 
-Allows built trees to be copied or moved without invalidating RPATH entires.
+Allows built trees to be copied or moved without invalidating RPATH entries.
 
 The `LINKER_USE_RPATH` Makefile variable (see `configure/CONFIG_SITE`) may be
 set to `YES`, `NO`, and a new third option `ORIGIN`.  This is limited to
diff --git a/documentation/RELEASE-7.0.5.md b/documentation/RELEASE-7.0.5.md
index cab17a98d..afe1cab54 100644
--- a/documentation/RELEASE-7.0.5.md
+++ b/documentation/RELEASE-7.0.5.md
@@ -147,7 +147,7 @@ This also fixes [lauchpad bug #1714455](https://bugs.launchpad.net/bugs/1714455)
   declared in epicsString.h no longer accept octal escaped characters such as
   `\123` or `\41`.
 - The routine `epicsStrnEscapedFromRaw()` now generates hex
-  excaped characters for unprintable characters such as `\x1f`.
+  escaped characters for unprintable characters such as `\x1f`.
 - Hex escape character sequences `\xXX` must now contain exactly 2 hex digits.
 - An escape sequence `\0` now generates a zero byte in the raw string, but the
   other digits `1-9` should not appear after a back-slash.
diff --git a/documentation/RELEASE-7.0.7.md b/documentation/RELEASE-7.0.7.md
index 5ed0104f5..8c9043c58 100644
--- a/documentation/RELEASE-7.0.7.md
+++ b/documentation/RELEASE-7.0.7.md
@@ -117,7 +117,7 @@ with the TCP port number selected.
 
 DBD files generated by the `dbdExpand.pl` script are now sorted within each
 item type by the primary name of the item. The result should resolve any
-issues with reproducable builds. No option is provided to prevent the sorting,
+issues with reproducible builds. No option is provided to prevent the sorting,
 previously the order was essentially random and varied each time.
 
 ### `dbExpand.pl` sorts records by name
diff --git a/documentation/RELEASE-7.0.8.md b/documentation/RELEASE-7.0.8.md
index b9b071467..f8477a61b 100644
--- a/documentation/RELEASE-7.0.8.md
+++ b/documentation/RELEASE-7.0.8.md
@@ -35,7 +35,7 @@ record(bi, "bit1") {
 
 ### ANSI escapes in stderr
 
-ANSI escape charactor sequences may now be printed to the stderr stream.
+ANSI escape character sequences may now be printed to the stderr stream.
 These escapes will appear in logs captured from that stream.
 Tools which parse and/or render these logs may need to be adjusted to
 either strip out the escapes, or to translate them into markup.
@@ -227,7 +227,7 @@ The pvDatabase module was updated to version 4.7.1:
 
   `_[distributor=group:<group id>;set:<set_id>;trigger:<field_name>;updates:<n_updates>;mode:<update_mode>]`
 
-  The plugin parameters are optional and are described bellow:
+  The plugin parameters are optional and are described below:
 
   - group: this parameter indicates a group that client application belongs to (default value: "default"); groups of clients are completely independent of each other
 
diff --git a/documentation/RELEASE-7.0.9.md b/documentation/RELEASE-7.0.9.md
index 015f50c06..71883905d 100644
--- a/documentation/RELEASE-7.0.9.md
+++ b/documentation/RELEASE-7.0.9.md
@@ -25,7 +25,7 @@ although it doesn't currently cover the new processes added to epics-base.
 Much of the documentation generated from .dbd.pod files at build time is now
 also being converted into MarkDown (.md) files and installed into the top-level
 `doc` directory. Some users might find it quicker to look up information about a
-record type by opening these files in a text editor intead of opening a browser
+record type by opening these files in a text editor instead of opening a browser
 and loading the HTML versions or finding and opening the files from the EPICS
 Documentation site.
 
@@ -97,7 +97,7 @@ record("#", "unwanted") {}
 
 ### Only keep readline history for interactive sessions
 
-Previously, all IOCsh commands were persisited in the libreadline history
+Previously, all IOCsh commands were persisted in the libreadline history
 (when readline support is included).
 Going forward, only interactive commands are saved.
 
@@ -111,7 +111,7 @@ already be conditionally casting to/from the appropriate type.
 
 ### Fix issues with `_FORTIFY_SOURCE=3`
 
-This release fixes the false positives failures whhen building with `_FORTIFY_SOURCE` level 3.
+This release fixes the false positives failures when building with `_FORTIFY_SOURCE` level 3.
 The override introduced in 7.0.8.1 has been removed.
 
 ### Other
diff --git a/documentation/ReleaseChecklist.html b/documentation/ReleaseChecklist.html
index 4ef9d98d9..19273a30f 100644
--- a/documentation/ReleaseChecklist.html
+++ b/documentation/ReleaseChecklist.html
@@ -419,7 +419,7 @@ everything that has to be done since it's so easy to miss steps.</p>
     <tr>
       <td><input type="checkbox"></td>
       <td>Website Editor</td>
-      <td>Link to the release webpage from other relevent areas of the
+      <td>Link to the release webpage from other relevant areas of the
         website - update front page and sidebars.</td>
       </tr>
     <tr>
diff --git a/documentation/new-notes/PR-558.md b/documentation/new-notes/PR-558.md
index 17f8a90cf..d3a343bc9 100644
--- a/documentation/new-notes/PR-558.md
+++ b/documentation/new-notes/PR-558.md
@@ -9,7 +9,7 @@ This release incorporates [PR #558](https://github.com/epics-base/epics-base/pul
 - it replaces the community [`afterInit`](https://github.com/paulscherrerinstitute/iocsh_utilities/blob/master/afterInit.c) and [`doAfterIocInit`](https://github.com/epics-modules/std/blob/master/stdApp/src/delayCmd.cpp) IOC shell commands,
 - community usage examples:
   - [`pf4filters.iocsh`](https://github.com/epics-modules/optics/blob/master/opticsApp/iocsh/pf4filters.iocsh) - enable/disable with a single comment ([full description](https://github.com/epics-base/epics-base/pull/558#issuecomment-2430057167))
-  - [ALS-U autosave managment](https://github.com/epics-base/epics-base/pull/558#issuecomment-2430447220)
+  - [ALS-U autosave management](https://github.com/epics-base/epics-base/pull/558#issuecomment-2430447220)
 
 #### Features
 
diff --git a/documentation/new-notes/PR-644.md b/documentation/new-notes/PR-644.md
index d30bb2018..a288ef1ed 100644
--- a/documentation/new-notes/PR-644.md
+++ b/documentation/new-notes/PR-644.md
@@ -12,7 +12,7 @@ prints.
 - The default IOC Shell prompt is now displayed in green; this color can be
 modified in the `configure/CONFIG_SITE_ENV` file for all targets, or set for
 a specific target by adding a `configure/os/CONFIG_SITE_ENV.<arch>` file.
-The value of the `IOCSH_PS1` environment paremeter in those files can use the
+The value of the `IOCSH_PS1` environment parameter in those files can use the
 `ANSI_ENV_*` and `ANSI_*()` color macros found in errlog.h to configure the
 appearance of the prompt. The C string literal concatenation syntax can be
 used to construct the prompt string:
diff --git a/modules/ca/src/client/CAref.html b/modules/ca/src/client/CAref.html
index 7b6ff143f..9b5c95bb3 100644
--- a/modules/ca/src/client/CAref.html
+++ b/modules/ca/src/client/CAref.html
@@ -103,7 +103,7 @@ in the file LICENSE that is included with this distribution.</span></p>
     <ul>
       <li><a href="#Broadcast">Client and Server Broadcast Addresses Don't
         Match</a></li>
-      <li><a href="#Client">Client Isnt Configured to Use the Server's
+      <li><a href="#Client">Client Isn't Configured to Use the Server's
       Port</a></li>
       <li><a href="#Unicast">Unicast Addresses in the EPICS_CA_ADDR_LIST Does
         not Reliably Contact Servers Sharing the Same UDP Port on the Same
@@ -759,7 +759,7 @@ to respect the EPICS_CA_MAX_ARRAY_BYTES setting as described below instead.</p>
 <p>Starting with version R3.14 the environment variable
 EPICS_CA_MAX_ARRAY_BYTES determines the size of the largest array that may pass
 through CA. Prior to this version only arrays smaller than 16k bytes could be
-transfered. The CA libraries maintains a free list of 16384 byte network
+transferred. The CA libraries maintains a free list of 16384 byte network
 buffers that are used for ordinary communication. If EPICS_CA_MAX_ARRAY_BYTES
 is larger than 16384 then a second free list of larger data buffers is
 established and used only after a client send its first large array request.</p>
@@ -1085,7 +1085,7 @@ to standard out.</p>
 
 <p>If a value is specified it is written to the PV. Next, the current value of
 the PV is converted to each of the many external data type that can be
-specified at the CA client library interface, and each of these is formated and
+specified at the CA client library interface, and each of these is formatted and
 then output to the console.</p>
 <hr>
 
@@ -1631,7 +1631,7 @@ stdout.</p>
 
 <p>The -s option allows to specify an interest level for calling Channel
 Access' internal report function <code>ca_client_status()</code>, that prints lots of
-internal informations on stdout, including environment settings, used CA ports
+internal information on stdout, including environment settings, used CA ports
 etc.</p>
 
 <table border="1">
@@ -1969,7 +1969,7 @@ that the request is sent call <code>ca_flush_io()</code> followed by
 
 <h3><a name="Problems">ENOBUFS Messages</a></h3>
 
-<p>Many Berkley UNIX derived Internet Protocol (IP) kernels use a memory
+<p>Many Berkeley UNIX derived Internet Protocol (IP) kernels use a memory
 management scheme with a fixed sized low level memory allocation quantum called
 an "mbuf". Messages about "ENOBUFS" are an indication that your IP kernel is
 running low on mbuf buffers. An IP kernel mbuf starvation situation may lead to
diff --git a/modules/ca/src/client/access.cpp b/modules/ca/src/client/access.cpp
index 58cc4bca5..6b4ef323d 100644
--- a/modules/ca/src/client/access.cpp
+++ b/modules/ca/src/client/access.cpp
@@ -65,7 +65,7 @@ const char * ca_message_text []
 "Sorry, that feature is planned but not supported at this time",
 "The supplied string is unusually large",
 "The request was ignored because the specified channel is disconnected",
-"The data type specifed is invalid",
+"The data type specified is invalid",
 
 "Remote Channel not found",
 "Unable to locate all user specified channels",
@@ -94,7 +94,7 @@ const char * ca_message_text []
 "The supplied string is empty",
 "Unable to spawn the CA repeater thread- auto reconnect will fail",
 "No channel id match for search reply- search reply ignored",
-"Reseting dead connection- will try to reconnect",
+"Resetting dead connection- will try to reconnect",
 "Server (IOC) has fallen behind or is not responding- still waiting",
 
 "No internet interface with broadcast available",
@@ -381,11 +381,11 @@ int epicsStdCall ca_clear_channel ( chid pChan )
     }
     else {
         //
-        // we will definately stall out here if all of the
+        // we will definitely stall out here if all of the
         // following are true
         //
         // o user creates non-preemptive mode client library context
-        // o user doesnt periodically call a ca function
+        // o user doesn't periodically call a ca function
         // o user calls this function from an auxiliary thread
         //
         CallbackGuard cbGuard ( cac.cbMutex );
diff --git a/modules/ca/src/client/acctst.c b/modules/ca/src/client/acctst.c
index 101da24c1..cf7c23908 100644
--- a/modules/ca/src/client/acctst.c
+++ b/modules/ca/src/client/acctst.c
@@ -844,7 +844,7 @@ void verifyBlockInPendIO ( chid chan, unsigned interestLevel  )
             }
         }
         else if ( resp != -100 ) {
-            printf ( "CA didnt block for get to return?\n" );
+            printf ( "CA didn't block for get to return?\n" );
         }
 
         req = 1;
@@ -1739,7 +1739,7 @@ void arrayEventExceptionNotify ( struct event_handler_args args )
     if ( args.status == ECA_NORMAL ) {
         printf (
             "arrayEventExceptionNotify: expected "
-            "exception but didnt receive one against \"%s\" \n",
+            "exception but didn't receive one against \"%s\" \n",
             ca_name ( args.chid ) );
     }
     else {
@@ -3233,7 +3233,7 @@ void verifyDisconnect (
 
     /*
      * if its a local channel and will never disconnect
-     * then skip the portions of this test that cant be
+     * then skip the portions of this test that can't be
      * completed.
      */
     if ( ca_get_ioc_connection_count () == 0 ) {
@@ -3307,7 +3307,7 @@ void verifyContextRundownFlush ( const char * pName, unsigned interestLevel )
 
             status = ca_create_channel  ( pName, 0, 0, 0, & chan );
             /*
-             * currently in-memory channels cant be used with this test
+             * currently in-memory channels can't be used with this test
              * !!!! FIX ME, FIX ME, FIX ME, FIX ME !!!!
              */
             if ( status != ECA_UNAVAILINSERV ) {
@@ -3335,7 +3335,7 @@ void verifyContextRundownFlush ( const char * pName, unsigned interestLevel )
             status = ca_create_channel  ( pName, 0, 0, 0, & chan );
             SEVCHK ( status, NULL );
             /*
-             * currently in-memory channels cant be used with this test
+             * currently in-memory channels can't be used with this test
              * !!!! FIX ME, FIX ME, FIX ME, FIX ME !!!!
              */
             if ( status != ECA_UNAVAILINSERV ) {
@@ -3379,7 +3379,7 @@ void verifyContextRundownChanStillExist (
     for ( i = 0; i < NELEMENTS ( chan ); i++ ) {
         status = ca_create_channel  ( pName, 0, 0, 0, & chan[i] );
         /*
-         * currently in-memory channels cant be used with this test
+         * currently in-memory channels can't be used with this test
          * !!!! FIX ME, FIX ME, FIX ME, FIX ME !!!!
          */
         if ( status == ECA_UNAVAILINSERV ) {
diff --git a/modules/ca/src/client/bhe.cpp b/modules/ca/src/client/bhe.cpp
index 3808f061c..450db6927 100644
--- a/modules/ca/src/client/bhe.cpp
+++ b/modules/ca/src/client/bhe.cpp
@@ -192,7 +192,7 @@ bool bhe::updatePeriod (
         this->beaconAnomalyNotify ( guard );
 
         /*
-         * this is the 2nd beacon seen. We cant tell about
+         * this is the 2nd beacon seen. We can't tell about
          * the change in period at this point so we just
          * initialize the average period and return.
          */
diff --git a/modules/ca/src/client/caProto.h b/modules/ca/src/client/caProto.h
index 57b280177..188e098f2 100644
--- a/modules/ca/src/client/caProto.h
+++ b/modules/ca/src/client/caProto.h
@@ -49,7 +49,7 @@
 
 /*
  * These port numbers are only used if the CA repeater and
- * CA server port numbers cant be obtained from the EPICS
+ * CA server port numbers can't be obtained from the EPICS
  * environment variables "EPICS_CA_REPEATER_PORT" and
  * "EPICS_CA_SERVER_PORT"
  */
diff --git a/modules/ca/src/client/ca_client_context.cpp b/modules/ca/src/client/ca_client_context.cpp
index 1e830fd08..1507fceec 100644
--- a/modules/ca/src/client/ca_client_context.cpp
+++ b/modules/ca/src/client/ca_client_context.cpp
@@ -775,11 +775,11 @@ LIBCA_API int epicsStdCall ca_clear_subscription ( evid pMon )
     }
     else {
       //
-      // we will definately stall out here if all of the
+      // we will definitely stall out here if all of the
       // following are true
       //
       // o user creates non-preemptive mode client library context
-      // o user doesnt periodically call a ca function
+      // o user doesn't periodically call a ca function
       // o user calls this function from an auxiliary thread
       //
       CallbackGuard cbGuard ( cac.cbMutex );
diff --git a/modules/ca/src/client/ca_test.md b/modules/ca/src/client/ca_test.md
index c0b3c3fd4..e61ef644e 100644
--- a/modules/ca/src/client/ca_test.md
+++ b/modules/ca/src/client/ca_test.md
@@ -7,4 +7,4 @@
 If a value is specified it is written to the PV. Next, the current value
 of the PV is converted to each of the many external data type that can
 be specified at the CA client library interface, and each of these is
-formated and then output to the console.
+formatted and then output to the console.
diff --git a/modules/ca/src/client/cadef.h b/modules/ca/src/client/cadef.h
index 5c60a06f7..a112021c3 100644
--- a/modules/ca/src/client/cadef.h
+++ b/modules/ca/src/client/cadef.h
@@ -1461,7 +1461,7 @@ LIBCA_API unsigned epicsStdCall ca_get_host_name ( chid pChan,
     char *pBuf, unsigned bufLength );
 
 /** \brief Return the minor protocol version number used by the host to
- *  which a channel is cuurently connected.   
+ *  which a channel is currently connected.   
  *
  * \param[in] pChan channel identifier
  * \returns The minor protocol version number.
diff --git a/modules/ca/src/client/caerr.h b/modules/ca/src/client/caerr.h
index 95df2cebc..bd37881db 100644
--- a/modules/ca/src/client/caerr.h
+++ b/modules/ca/src/client/caerr.h
@@ -108,7 +108,7 @@
 #define ECA_STRTOBIG        DEFMSG(CA_K_WARNING,   12) /* defunct */
 /// The request was ignored because the specified channel is disconnected
 #define ECA_DISCONNCHID     DEFMSG(CA_K_ERROR,     13) /* defunct */
-/// The data type specifed is invalid
+/// The data type specified is invalid
 #define ECA_BADTYPE         DEFMSG(CA_K_ERROR,     14)
 /// Remote Channel not found
 #define ECA_CHIDNOTFND      DEFMSG(CA_K_INFO,      15) /* defunct */
@@ -146,7 +146,7 @@
 #define ECA_NEWADDR         DEFMSG(CA_K_WARNING,   31) /* defunct */
 /// New or resumed network connection
 #define ECA_NEWCONN         DEFMSG(CA_K_INFO,      32) /* defunct */
-/// Specified task isnt a member of a CA context
+/// Specified task isn't a member of a CA context
 #define ECA_NOCACTX         DEFMSG(CA_K_WARNING,   33) /* defunct */
 /// Attempt to use defunct CA feature failed
 #define ECA_DEFUNCT         DEFMSG(CA_K_FATAL,     34) /* defunct */
@@ -156,7 +156,7 @@
 #define ECA_NOREPEATER      DEFMSG(CA_K_WARNING,   36) /* defunct */
 /// No channel id match for search reply- search reply ignored
 #define ECA_NOCHANMSG       DEFMSG(CA_K_WARNING,   37) /* defunct */
-/// Reseting dead connection- will try to reconnect
+/// Resetting dead connection- will try to reconnect
 #define ECA_DLCKREST        DEFMSG(CA_K_WARNING,   38) /* defunct */
 /// Server (IOC) has fallen behind or is not responding- still waiting
 #define ECA_SERVBEHIND      DEFMSG(CA_K_WARNING,   39) /* defunct */
diff --git a/modules/ca/src/client/comQueSend.cpp b/modules/ca/src/client/comQueSend.cpp
index c0c535f42..9d63fd908 100644
--- a/modules/ca/src/client/comQueSend.cpp
+++ b/modules/ca/src/client/comQueSend.cpp
@@ -24,14 +24,14 @@
 
 //
 // Requirements:
-// 1) Allow sufficent headroom so that users will be able to perform
+// 1) Allow sufficient headroom so that users will be able to perform
 // a reasonable amount of IO within CA callbacks without experiencing
 // a push/pull deadlock. If a potential push/pull deadlock situation
 // occurs then detect and avoid it and provide diagnostic to the user
 // via special status.
 // 2) Return status to the user when there is insufficient memory to
 // queue a complete message.
-// 3) return status to the user when a message cant be flushed because
+// 3) return status to the user when a message can't be flushed because
 // a connection dropped.
 // 4) Do not allocate too much memory in exception situations (such as
 // after a circuit disconnect).
diff --git a/modules/ca/src/client/convert.cpp b/modules/ca/src/client/convert.cpp
index 361b60222..e2dfae030 100644
--- a/modules/ca/src/client/convert.cpp
+++ b/modules/ca/src/client/convert.cpp
@@ -17,7 +17,7 @@
  *
  *  1) All routines in this file have an encode argument which
  *  determines if we are converting from the standard format to
- *  the local format or vise versa. To date only float and double data
+ *  the local format or vice versa. To date only float and double data
  *  types must be converted differently depending on the encode
  *  argument - joh
  *
diff --git a/modules/ca/src/client/nciu.cpp b/modules/ca/src/client/nciu.cpp
index fc5d3cb4c..347c5c031 100644
--- a/modules/ca/src/client/nciu.cpp
+++ b/modules/ca/src/client/nciu.cpp
@@ -154,7 +154,7 @@ void nciu::connect ( unsigned nativeType,
     // the callback lock is also taken when a channel
     // disconnects to prevent a race condition with the
     // code below - ie we hold the callback lock here
-    // so a channel cant be destroyed out from under us.
+    // so a channel can't be destroyed out from under us.
     this->notify().connectNotify ( guard );
 }
 
@@ -625,7 +625,7 @@ unsigned channelNode::getSearchTimerIndex (
     }
     else {
         throw std::runtime_error (
-            "channel was expected to be in a search timer, but wasnt" );;
+            "channel was expected to be in a search timer, but wasn't" );;
     }
     return index;
 }
diff --git a/modules/ca/src/client/netiiu.cpp b/modules/ca/src/client/netiiu.cpp
index 04a5fb524..87ad704af 100644
--- a/modules/ca/src/client/netiiu.cpp
+++ b/modules/ca/src/client/netiiu.cpp
@@ -167,7 +167,7 @@ void netiiu::uninstallChanDueToSuccessfulSearchResponse (
     epicsGuard < epicsMutex > &, nciu &, const epicsTime & )
 {
     throw std::runtime_error (
-        "search response occured when not attached to udpiiu?" );
+        "search response occurred when not attached to udpiiu?" );
 }
 
 bool netiiu::searchMsg (
diff --git a/modules/ca/src/client/oldAccess.h b/modules/ca/src/client/oldAccess.h
index 3e8edb914..ec2df38ca 100644
--- a/modules/ca/src/client/oldAccess.h
+++ b/modules/ca/src/client/oldAccess.h
@@ -597,11 +597,11 @@ void ca_client_context :: whenThereIsAnExceptionDestroySyncGroupIO (
         epicsGuardRelease < epicsMutex > guardRelease ( guard );
         {
             //
-            // we will definately stall out here if all of the
+            // we will definitely stall out here if all of the
             // following are true
             //
             // o user creates non-preemptive mode client library context
-            // o user doesnt periodically call a ca function
+            // o user doesn't periodically call a ca function
             // o user calls this function from an auxiliary thread
             //
             CallbackGuard cbGuard ( this->cbMutex );
diff --git a/modules/ca/src/client/searchTimer.cpp b/modules/ca/src/client/searchTimer.cpp
index 60b153639..61dbda217 100644
--- a/modules/ca/src/client/searchTimer.cpp
+++ b/modules/ca/src/client/searchTimer.cpp
@@ -353,7 +353,7 @@ void searchTimer::uninstallChanDueToSuccessfulSearchResponse (
                     // when we get 100% success immediately
                     // send another search request
                     //
-                    debugPrintf ( ( "All requests succesful, set timer delay to zero\n" ) );
+                    debugPrintf ( ( "All requests successful, set timer delay to zero\n" ) );
                     this->timer.start ( *this, currentTime );
                 }
             }
diff --git a/modules/ca/src/client/syncgrp.cpp b/modules/ca/src/client/syncgrp.cpp
index 4f79348fd..3967eacb8 100644
--- a/modules/ca/src/client/syncgrp.cpp
+++ b/modules/ca/src/client/syncgrp.cpp
@@ -79,11 +79,11 @@ extern "C" int epicsStdCall ca_sg_delete ( const CA_SYNC_GID gid )
         }
         else {
           //
-          // we will definately stall out here if all of the
+          // we will definitely stall out here if all of the
           // following are true
           //
           // o user creates non-preemptive mode client library context
-          // o user doesnt periodically call a ca function
+          // o user doesn't periodically call a ca function
           // o user calls this function from an auxiliary thread
           //
           CallbackGuard cbGuard ( pcac->cbMutex );
@@ -103,11 +103,11 @@ void sync_group_reset ( ca_client_context & client, CASG & sg )
     }
     else {
         //
-        // we will definately stall out here if all of the
+        // we will definitely stall out here if all of the
         // following are true
         //
         // o user creates non-preemptive mode client library context
-        // o user doesnt periodically call a ca function
+        // o user doesn't periodically call a ca function
         // o user calls this function from an auxiliary thread
         //
         CallbackGuard cbGuard ( client.cbMutex );
@@ -216,11 +216,11 @@ extern "C" int epicsStdCall ca_sg_test ( const CA_SYNC_GID gid )
             }
             else {
               //
-              // we will definately stall out here if all of the
+              // we will definitely stall out here if all of the
               // following are true
               //
               // o user creates non-preemptive mode client library context
-              // o user doesnt periodically call a ca function
+              // o user doesn't periodically call a ca function
               // o user calls this function from an auxiliary thread
               //
               CallbackGuard cbGuard ( pcac->cbMutex );
diff --git a/modules/ca/src/client/tcpRecvWatchdog.cpp b/modules/ca/src/client/tcpRecvWatchdog.cpp
index 367e09237..e8e8f93c0 100644
--- a/modules/ca/src/client/tcpRecvWatchdog.cpp
+++ b/modules/ca/src/client/tcpRecvWatchdog.cpp
@@ -97,7 +97,7 @@ void tcpRecvWatchdog::beaconArrivalNotify (
     guard.assertIdenticalMutex ( this->mutex );
     if ( ! ( this->shuttingDown || this->beaconAnomaly || this->probeResponsePending ) ) {
         this->timer.start ( *this, this->period );
-        debugPrintf ( ("saw a normal beacon - reseting circuit receive watchdog\n") );
+        debugPrintf ( ("saw a normal beacon - resetting circuit receive watchdog\n") );
     }
 }
 
@@ -124,7 +124,7 @@ void tcpRecvWatchdog::messageArrivalNotify (
     if ( ! ( this->shuttingDown || this->probeResponsePending ) ) {
         this->beaconAnomaly = false;
         this->timer.start ( *this, this->period );
-        debugPrintf ( ("received a message - reseting circuit recv watchdog\n") );
+        debugPrintf ( ("received a message - resetting circuit recv watchdog\n") );
     }
 }
 
@@ -182,7 +182,7 @@ void tcpRecvWatchdog::sendBacklogProgressNotify (
     // receive at least one message from the server.
     if ( this->probeResponsePending && ! this->shuttingDown ) {
         this->timer.start ( *this, CA_ECHO_TIMEOUT );
-        debugPrintf ( ("saw heavy send backlog - reseting circuit recv watchdog\n") );
+        debugPrintf ( ("saw heavy send backlog - resetting circuit recv watchdog\n") );
     }
 }
 
diff --git a/modules/ca/src/client/tcpiiu.cpp b/modules/ca/src/client/tcpiiu.cpp
index b8ebaac32..511582c7f 100644
--- a/modules/ca/src/client/tcpiiu.cpp
+++ b/modules/ca/src/client/tcpiiu.cpp
@@ -1824,7 +1824,7 @@ void tcpiiu::disconnectAllChannels (
     }
 
     while ( nciu * pChan = this->createRespPend.get () ) {
-        // we don't yet know the server's id so we cant
+        // we don't yet know the server's id so we can't
         // send a channel delete request and will instead
         // trust that the server can do the proper cleanup
         // when the circuit disconnects
@@ -1890,7 +1890,7 @@ void tcpiiu::unlinkAllChannels (
     while ( nciu * pChan = this->createRespPend.get () ) {
         pChan->channelNode::listMember =
             channelNode::cs_none;
-        // we don't yet know the server's id so we cant
+        // we don't yet know the server's id so we can't
         // send a channel delete request and will instead
         // trust that the server can do the proper cleanup
         // when the circuit disconnects
diff --git a/modules/ca/src/client/udpiiu.cpp b/modules/ca/src/client/udpiiu.cpp
index bfe3d628e..3e981450f 100644
--- a/modules/ca/src/client/udpiiu.cpp
+++ b/modules/ca/src/client/udpiiu.cpp
@@ -83,7 +83,7 @@ double getMaxPeriod()
             }
         }
         else {
-            epicsPrintf ( "EPICS \"%s\" wasnt a real number\n",
+            epicsPrintf ( "EPICS \"%s\" wasn't a real number\n",
                             EPICS_CA_MAX_SEARCH_PERIOD.name );
             epicsPrintf ( "Setting \"%s\" = %f seconds\n",
                 EPICS_CA_MAX_SEARCH_PERIOD.name, maxPeriod );
diff --git a/modules/ca/src/perl/Cap5.xs b/modules/ca/src/perl/Cap5.xs
index 5da894808..9ba55320b 100644
--- a/modules/ca/src/perl/Cap5.xs
+++ b/modules/ca/src/perl/Cap5.xs
@@ -64,7 +64,7 @@ const char * get_error_msg(int status) {
         "ECA_NOSUPPORT - Sorry, that feature is planned but not supported at this time",
         "ECA_STRTOBIG - The supplied string is unusually large",
         "ECA_DISCONNCHID - The request was ignored because the specified channel is disconnected",
-        "ECA_BADTYPE - The data type specifed is invalid",
+        "ECA_BADTYPE - The data type specified is invalid",
         "ECA_CHIDNOTFND - Remote Channel not found",
         "ECA_CHIDRETRY - Unable to locate all user specified channels",
         "ECA_INTERNAL - Channel Access Internal Failure",
@@ -83,12 +83,12 @@ const char * get_error_msg(int status) {
         "ECA_BADMONID - Bad event subscription (monitor) identifier",
         "ECA_NEWADDR - Remote channel has new network address",
         "ECA_NEWCONN - New or resumed network connection",
-        "ECA_NOCACTX - Specified task isnt a member of a CA context",
+        "ECA_NOCACTX - Specified task isn't a member of a CA context",
         "ECA_DEFUNCT - Attempt to use defunct CA feature failed",
         "ECA_EMPTYSTR - The supplied string is empty",
         "ECA_NOREPEATER - Unable to spawn the CA repeater thread- auto reconnect will fail",
         "ECA_NOCHANMSG - No channel id match for search reply- search reply ignored",
-        "ECA_DLCKREST - Reseting dead connection- will try to reconnect",
+        "ECA_DLCKREST - Resetting dead connection- will try to reconnect",
         "ECA_SERVBEHIND - Server (IOC) has fallen behind or is not responding- still waiting",
         "ECA_NOCAST - No internet interface with broadcast available",
         "ECA_BADMASK - Invalid event selection mask",
@@ -886,7 +886,7 @@ void CA_get_callback(SV *ca_ref, SV *sub, ...) {
     while (items > i
         && SvOK(ST(i))) {
         if (SvIOK(ST(i))) {
-            /* Interger => Count arg, zero means current size */
+            /* Integer => Count arg, zero means current size */
             count = SvIV(ST(i));
             if (count < 0 || count > ca_element_count(pch->chan)) {
                 croak_msg = "Requested array size is out of range";
@@ -962,7 +962,7 @@ SV * CA_create_subscription(SV *ca_ref, const char *mask_str, SV *sub, ...) {
     while (items > i
         && SvOK(ST(i))) {
         if (SvIOK(ST(i))) {
-            /* Interger => Count arg, zero means current size */
+            /* Integer => Count arg, zero means current size */
             count = SvIV(ST(i));
             if (count < 0 || count > ca_element_count(pch->chan)) {
                 croak_msg = "Requested array size is out of range";
diff --git a/modules/ca/src/perl/Makefile b/modules/ca/src/perl/Makefile
index 98eaedc93..77130d5b5 100644
--- a/modules/ca/src/perl/Makefile
+++ b/modules/ca/src/perl/Makefile
@@ -23,7 +23,7 @@ ifdef T_A
 # Special settings for Darwin:
 ifeq ($(OS_CLASS),Darwin)
   # Use hdepends command (not GNU compiler flags)
-  # to generate header file dependancies for Darwin.
+  # to generate header file dependencies for Darwin.
   # Darwin has multiple -arch compiler flags.
   HDEPENDS_METHOD = MKMF
 
diff --git a/modules/ca/src/template/top/caPerlApp/caput.pl b/modules/ca/src/template/top/caPerlApp/caput.pl
index 4df1c6de2..0ea572412 100644
--- a/modules/ca/src/template/top/caPerlApp/caput.pl
+++ b/modules/ca/src/template/top/caPerlApp/caput.pl
@@ -167,7 +167,7 @@ sub HELP_MESSAGE {
         "  -w <sec>:  Wait time, specifies CA timeout, default is $opt_w second\n",
         "  -c: Use put_callback to wait for completion\n",
         "Format options:\n",
-        "  -t: Terse mode - print only sucessfully written value, without name\n",
+        "  -t: Terse mode - print only successfully written value, without name\n",
         "  -l: Long mode \"name timestamp value stat sevr\" (read PVs as DBR_TIME_xxx)\n",
         "  -S: Put string as an array of char (long string)\n",
         "Enum format:\n",
diff --git a/modules/ca/src/tools/cainfo.md b/modules/ca/src/tools/cainfo.md
index 41de40feb..a48801f60 100644
--- a/modules/ca/src/tools/cainfo.md
+++ b/modules/ca/src/tools/cainfo.md
@@ -14,7 +14,7 @@ to stdout.
 
 The {option}`-s` option allows to specify an interest level for calling Channel
 Access' internal report function `ca_client_status()`, that prints lots
-of internal informations on stdout, including environment settings, used
+of internal information on stdout, including environment settings, used
 CA ports etc.
 
 ## Options
diff --git a/modules/ca/src/tools/caput.c b/modules/ca/src/tools/caput.c
index 1e9158426..fe5374a55 100644
--- a/modules/ca/src/tools/caput.c
+++ b/modules/ca/src/tools/caput.c
@@ -68,7 +68,7 @@ void usage (void)
     "  -c: Asynchronous put (use ca_put_callback and wait for completion)\n"
     "  -p <prio>: CA priority (0-%u, default 0=lowest)\n"
     "Format options:\n"
-    "  -t: Terse mode - print only sucessfully written value, without name\n"
+    "  -t: Terse mode - print only successfully written value, without name\n"
     "  -l: Long mode \"name timestamp value stat sevr\" (read PVs as DBR_TIME_xxx)\n"
     "Enum format:\n"
     "  Default: Auto - try value as ENUM string, then as index number\n"
@@ -571,7 +571,7 @@ int main (int argc, char *argv[])
     }
 
     if (result != ECA_NORMAL) {
-        fprintf(stderr, ERL_ERROR " occured writing data: %s\n", ca_message(result));
+        fprintf(stderr, ERL_ERROR " occurred writing data: %s\n", ca_message(result));
         free(sbuf); free(dbuf); free(ebuf);
         return 1;
     }
diff --git a/modules/database/src/ioc/as/asIocRegister.c b/modules/database/src/ioc/as/asIocRegister.c
index b0451bc17..d7885ed3a 100644
--- a/modules/database/src/ioc/as/asIocRegister.c
+++ b/modules/database/src/ioc/as/asIocRegister.c
@@ -33,7 +33,7 @@ static const iocshArg asSetSubstitutionsArg0 = { "substitutions",iocshArgString}
 static const iocshArg * const asSetSubstitutionsArgs[] = {&asSetSubstitutionsArg0};
 static const iocshFuncDef asSetSubstitutionsFuncDef =
     {"asSetSubstitutions",1,asSetSubstitutionsArgs,
-     "Set subtitutions used when reading ACF file.\n"
+     "Set substitutions used when reading ACF file.\n"
      "No immediate effect.  Run asInit to (re)load.\n"
      "Example: asSetSubstitutions var1=5,var2=hello\n"};
 static void asSetSubstitutionsCallFunc(const iocshArgBuf *args)
diff --git a/modules/database/src/ioc/bpt/makeBpt.c b/modules/database/src/ioc/bpt/makeBpt.c
index 1038598bd..dd6e8d6f4 100644
--- a/modules/database/src/ioc/bpt/makeBpt.c
+++ b/modules/database/src/ioc/bpt/makeBpt.c
@@ -360,7 +360,7 @@ static int create_break( struct brkCreateInfo *pbci, brkInt *pabrkInt,
         if (inc < 1)
             inc = 1;
         valid = TRUE;
-        /* keep trying intervals until cant do better */
+        /* keep trying intervals until can't do better */
         expanding = TRUE;       /* originally we are trying larger and larger
                                  * intervals */
         while (valid) {
diff --git a/modules/database/src/ioc/db/dbAccess.c b/modules/database/src/ioc/db/dbAccess.c
index e3901a757..4b90dc3cb 100644
--- a/modules/database/src/ioc/db/dbAccess.c
+++ b/modules/database/src/ioc/db/dbAccess.c
@@ -183,7 +183,7 @@ static void get_enum_strs(DBADDR *paddr, char **ppbuffer,
         }
 
         if(nchoices > NELEMENTS(penum->strs))
-            nchoices = NELEMENTS(penum->strs); /* availible > capacity, truncated list */
+            nchoices = NELEMENTS(penum->strs); /* available > capacity, truncated list */
 
         penum->no_str = nchoices;
 
@@ -1130,7 +1130,7 @@ static long dbPutFieldLink(DBADDR *paddr,
     }
 
     if (dbCanSetLink(plink, &link_info, new_devsup)) {
-        /* link type mis-match prevents assignment */
+        /* link type mismatch prevents assignment */
         status = S_dbLib_badField;
         goto unlock;
     }
diff --git a/modules/database/src/ioc/db/dbCa.c b/modules/database/src/ioc/db/dbCa.c
index 660fc5223..40c1e3fd8 100644
--- a/modules/database/src/ioc/db/dbCa.c
+++ b/modules/database/src/ioc/db/dbCa.c
@@ -120,7 +120,7 @@ static int dbca_chan_count;
  * The libca callbacks take no action if pca->plink==NULL.
  *
  *   dbCaPutLinkCallback causes an additional complication because
- *   when dbCaRemoveLink is called the callback may not have occured.
+ *   when dbCaRemoveLink is called the callback may not have occurred.
  *   If putComplete sees plink==0 it will not call the user's code.
  *   If pca->putCallback is non-zero, dbCaTask will call the
  *   user's callback AFTER it has called ca_clear_channel.
diff --git a/modules/database/src/ioc/db/dbChannel.h b/modules/database/src/ioc/db/dbChannel.h
index 4bfdd6bc3..b2b2af6a5 100644
--- a/modules/database/src/ioc/db/dbChannel.h
+++ b/modules/database/src/ioc/db/dbChannel.h
@@ -346,7 +346,7 @@ DBCORE_API void dbChannelInit(void);
 /** \brief Cleanup the dbChannel subsystem. */
 DBCORE_API void dbChannelExit(void);
 
-/** \brief Test the given PV name for existance.
+/** \brief Test the given PV name for existence.
  *
  * This routine looks up the given record and field name, but does not check
  * whether any field modifiers given after the field name are correct.
diff --git a/modules/database/src/ioc/db/dbCommon.dbd.pod b/modules/database/src/ioc/db/dbCommon.dbd.pod
index fe679fa1f..a3a52589b 100644
--- a/modules/database/src/ioc/db/dbCommon.dbd.pod
+++ b/modules/database/src/ioc/db/dbCommon.dbd.pod
@@ -521,7 +521,7 @@ hardware.
 
 =item *
 
-Positive values (normally between 1-255) get the time of the last occurance of
+Positive values (normally between 1-255) get the time of the last occurrence of
 the numbered generalTime event.
 
 =back
diff --git a/modules/database/src/ioc/db/dbIocRegister.c b/modules/database/src/ioc/db/dbIocRegister.c
index 06442df55..abdc28fa7 100644
--- a/modules/database/src/ioc/db/dbIocRegister.c
+++ b/modules/database/src/ioc/db/dbIocRegister.c
@@ -199,7 +199,7 @@ static const iocshFuncDef dblFuncDef = {"dbl",2,dblArgs,
                                         "Database list.\n"
                                         "List record/field names.\n"
                                         "With no arguments, lists all record names.\n"
-                                        "If record type is given, then only the names of records maching the type are printed\n"
+                                        "If record type is given, then only the names of records matching the type are printed\n"
                                         "If a field list is given, then their values are also printed\n\n"
                                         "Example: dbl(\"\")\n"
                                         "         dbl(\"ai\")\n"
@@ -440,7 +440,7 @@ static const iocshArg scanOnceQueueShowArg0 = { "reset",iocshArgInt};
 static const iocshArg * const scanOnceQueueShowArgs[1] =
     {&scanOnceQueueShowArg0};
 static const iocshFuncDef scanOnceQueueShowFuncDef = {"scanOnceQueueShow",1,scanOnceQueueShowArgs,
-                                                      "Show details and statitics of scan once queue processing.\n"};
+                                                      "Show details and statistics of scan once queue processing.\n"};
 static void scanOnceQueueShowCallFunc(const iocshArgBuf *args)
 {
     scanOnceQueueShow(args[0].ival);
diff --git a/modules/database/src/ioc/db/dbScan.h b/modules/database/src/ioc/db/dbScan.h
index 7454dea75..2439fd45f 100644
--- a/modules/database/src/ioc/db/dbScan.h
+++ b/modules/database/src/ioc/db/dbScan.h
@@ -112,7 +112,7 @@ DBCORE_API void scanIoInit(IOSCANPVT *ppios);
  * @return
  */
 DBCORE_API unsigned int scanIoRequest(IOSCANPVT pios);
-/** @brief Process all records on the scan list for the specificed priority.
+/** @brief Process all records on the scan list for the specified priority.
  *
  * Also executes the callback set by scanIoSetComplete()
  *
diff --git a/modules/database/src/ioc/db/dbTest.h b/modules/database/src/ioc/db/dbTest.h
index 875480fe5..5740ad1fc 100644
--- a/modules/database/src/ioc/db/dbTest.h
+++ b/modules/database/src/ioc/db/dbTest.h
@@ -27,7 +27,7 @@ DBCORE_API long dbnr(int verbose);
 /* list aliases */
 DBCORE_API long dbla(const char *pmask);
 /* list infos */
-DBCORE_API long dbli(const char *patern);
+DBCORE_API long dbli(const char *pattern);
 /*list records filtered by glob pattern*/
 DBCORE_API long dbglob(const char *ppattern,const char *fields);
 /*list records filtered by glob pattern; alias for dbglob*/
diff --git a/modules/database/src/ioc/db/dbUnitTest.c b/modules/database/src/ioc/db/dbUnitTest.c
index a11afee3a..bcbe9050e 100644
--- a/modules/database/src/ioc/db/dbUnitTest.c
+++ b/modules/database/src/ioc/db/dbUnitTest.c
@@ -307,7 +307,7 @@ void testdbGetArrFieldEqual(const char* pv, short dbfType, long nRequest, unsign
         long n, N = nRequest < cnt ? nRequest : cnt;
 
         if(!match)
-            testDiag("Length mis-match.  expected=%lu actual=%lu", cnt, nRequest);
+            testDiag("Length mismatch.  expected=%lu actual=%lu", cnt, nRequest);
 
         for(n=0; n<N; n++, gbuf+=vSize, pbuf+=vSize) {
 
diff --git a/modules/database/src/ioc/db/dbUnitTest.h b/modules/database/src/ioc/db/dbUnitTest.h
index fbacb65aa..51c2b522e 100644
--- a/modules/database/src/ioc/db/dbUnitTest.h
+++ b/modules/database/src/ioc/db/dbUnitTest.h
@@ -170,7 +170,7 @@ DBCORE_API void testMonitorWait(testMonitor*);
  * @since UNRELEASED
  */
 DBCORE_API void testMonitorSync(testMonitor*);
-/** Return the number of monitor events which have occured since create,
+/** Return the number of monitor events which have occurred since create,
  * or a previous reset (called reset=1).
  * Calling w/ reset=0 only returns the count.
  * Calling w/ reset=1 resets the count to zero and ensures that the next
diff --git a/modules/database/src/ioc/dbStatic/dbBase.h b/modules/database/src/ioc/dbStatic/dbBase.h
index b69cceca0..086c817c6 100644
--- a/modules/database/src/ioc/dbStatic/dbBase.h
+++ b/modules/database/src/ioc/dbStatic/dbBase.h
@@ -126,7 +126,7 @@ typedef struct dbRecordNode {
     struct dbRecordNode *aliasedRecnode; /* NULL unless flags|DBRN_FLAGS_ISALIAS */
 }dbRecordNode;
 
-/*dbRecordAttribute is for "psuedo" fields */
+/*dbRecordAttribute is for "pseudo" fields */
 /*pdbFldDes is so that other access routines work correctly*/
 /*Until base supports char * value MUST be fixed length string*/
 typedef struct dbRecordAttribute {
diff --git a/modules/database/src/ioc/dbStatic/dbLexRoutines.c b/modules/database/src/ioc/dbStatic/dbLexRoutines.c
index 7ea975986..06550d80e 100644
--- a/modules/database/src/ioc/dbStatic/dbLexRoutines.c
+++ b/modules/database/src/ioc/dbStatic/dbLexRoutines.c
@@ -712,7 +712,7 @@ static void dbRecordtypeEmpty(void)
     ptempListNode = (tempListNode *)ellFirst(&tempList);
     pdbRecordType = ptempListNode->item;
     fprintf(stderr, ERL_ERROR
-        ": Declaration of recordtype(%s) preceeded full definition.\n",
+        ": Declaration of recordtype(%s) preceded full definition.\n",
         pdbRecordType->name);
     yyerrorAbort(NULL);
 }
diff --git a/modules/database/src/ioc/dbStatic/dbStaticIocRegister.c b/modules/database/src/ioc/dbStatic/dbStaticIocRegister.c
index 21a34e857..2cc96f5aa 100644
--- a/modules/database/src/ioc/dbStatic/dbStaticIocRegister.c
+++ b/modules/database/src/ioc/dbStatic/dbStaticIocRegister.c
@@ -50,7 +50,7 @@ static const iocshArg dbDumpMenuArg1 = { "menuName",iocshArgString};
 static const iocshArg * const dbDumpMenuArgs[] = {
     &argPdbbase, &dbDumpMenuArg1};
 static const iocshFuncDef dbDumpMenuFuncDef = {"dbDumpMenu",2,dbDumpMenuArgs,
-                          "Dump information about the available menuNames and choices defined withing each menuName.\n"
+                          "Dump information about the available menuNames and choices defined within each menuName.\n"
                           "Example: dbDumpMenu pdbbase menuAlarmStat \n"
                           "If last argument(s) are missing, dump all menuNames information in the database.\n"};
 static void dbDumpMenuCallFunc(const iocshArgBuf *args)
diff --git a/modules/database/src/ioc/dbtemplate/dbtoolsIocRegister.c b/modules/database/src/ioc/dbtemplate/dbtoolsIocRegister.c
index 49a16a84e..5e6d23450 100644
--- a/modules/database/src/ioc/dbtemplate/dbtoolsIocRegister.c
+++ b/modules/database/src/ioc/dbtemplate/dbtoolsIocRegister.c
@@ -26,7 +26,7 @@ static const iocshFuncDef dbLoadTemplateFuncDef = {
     "for each template in the substitution file, and load them using 'dbLoadRecords'.\n\n"
     "The second argument provides extra variables to substitute in the\n"
     "template files (not the substitution file). The third argument provides\n"
-    "a list of paths to search through for the subsitution and template files.\n\n"
+    "a list of paths to search through for the substitution and template files.\n\n"
     "See 'help dbLoadRecords' for more information.\n\n"
     "Example: dbLoadTemplate db/my.substitutions 'user=myself,host=myhost' 'path/to/subst:path2/to2/subst2'\n",
 };
diff --git a/modules/database/src/ioc/dbtemplate/msi.md b/modules/database/src/ioc/dbtemplate/msi.md
index 649683f8e..8c1b92ec2 100644
--- a/modules/database/src/ioc/dbtemplate/msi.md
+++ b/modules/database/src/ioc/dbtemplate/msi.md
@@ -49,7 +49,7 @@ discouraged.
 :::
 
 ::: {option} -o <file>
-Output will be written to the specifed \<file\> rather than to the
+Output will be written to the specified \<file\> rather than to the
 standard output.
 :::
 
@@ -166,7 +166,7 @@ expanded properly.
 However neither back-slash characters nor quotes of either variety are
 removed when generating the output file, so depending on what is being
 output the single quote behaviour may not be useful and may even be a
-hinderance. It cannot be disabled in the current version of msi.
+hindrance. It cannot be disabled in the current version of msi.
 
 
 ### Template file commands
diff --git a/modules/database/src/ioc/rsrv/camessage.c b/modules/database/src/ioc/rsrv/camessage.c
index 36844d162..ea36ed310 100644
--- a/modules/database/src/ioc/rsrv/camessage.c
+++ b/modules/database/src/ioc/rsrv/camessage.c
@@ -1452,7 +1452,7 @@ static void sendAllUpdateAS ( struct client *client )
         }
         else {
             errlogPrintf (
-            "%s at %d: corrupt channel state detected durring AR update\n",
+            "%s at %d: corrupt channel state detected during AR update\n",
                 __FILE__, __LINE__);
         }
         pciu->state = rsrvCS_inService;
@@ -1493,7 +1493,7 @@ static void putNotifyErrorReply ( struct client *client, caHdrLargeArray *mp, in
         mp->m_available, 0 );
     if ( status != ECA_NORMAL ) {
         SEND_UNLOCK ( client );
-        errlogPrintf ("%s at %d: should always get sufficent space for put notify error reply\n",
+        errlogPrintf ("%s at %d: should always get sufficient space for put notify error reply\n",
             __FILE__, __LINE__);
         return;
     }
@@ -1835,7 +1835,7 @@ static int event_add_action (caHdrLargeArray *mp, void *pPayload, struct client
      * the monitors and I could get deadlocked.
      * The client is blocked sending and the server
      * task for the client is blocked sending in
-     * this case. I cant check the recv part of the
+     * this case. I can't check the recv part of the
      * socket in the client since I am still handling an
      * outstanding recv ( they must be processed in order).
      * I handle this problem in the server by using
@@ -2080,7 +2080,7 @@ static void search_fail_reply ( caHdrLargeArray *mp, void *pPayload, struct clie
         0u, mp->m_dataType, mp->m_count, mp->m_cid, mp->m_available, NULL );
     if ( status != ECA_NORMAL ) {
         SEND_UNLOCK ( client );
-        errlogPrintf ( "%s at %d: should always get sufficent space for search fail reply?\n",
+        errlogPrintf ( "%s at %d: should always get sufficient space for search fail reply?\n",
             __FILE__, __LINE__ );
         return;
     }
diff --git a/modules/database/src/ioc/rsrv/caserverio.c b/modules/database/src/ioc/rsrv/caserverio.c
index 4e953ef85..9c4072559 100644
--- a/modules/database/src/ioc/rsrv/caserverio.c
+++ b/modules/database/src/ioc/rsrv/caserverio.c
@@ -367,7 +367,7 @@ void cas_commit_msg ( struct client *pClient, ca_uint32_t size )
 
 /*
  * this assumes that we have already checked to see
- * if sufficent bytes are available
+ * if sufficient bytes are available
  */
 ca_uint16_t rsrvGetUInt16 ( struct message_buffer *recv )
 {
@@ -375,7 +375,7 @@ ca_uint16_t rsrvGetUInt16 ( struct message_buffer *recv )
     ca_uint16_t result;
     /*
      * this assumes that we have already checked to see
-     * if sufficent bytes are available
+     * if sufficient bytes are available
      */
     assert ( recv->cnt - recv->stk >= 2u );
     result  = pBuf[recv->stk++] << 8u;
@@ -385,7 +385,7 @@ ca_uint16_t rsrvGetUInt16 ( struct message_buffer *recv )
 
 /*
  * this assumes that we have already checked to see
- * if sufficent bytes are available
+ * if sufficient bytes are available
  */
 ca_uint32_t rsrvGetUInt32 ( struct message_buffer *recv )
 {
@@ -393,7 +393,7 @@ ca_uint32_t rsrvGetUInt32 ( struct message_buffer *recv )
     ca_uint32_t result;
     /*
      * this assumes that we have already checked to see
-     * if sufficent bytes are available
+     * if sufficient bytes are available
      */
     assert ( recv->cnt - recv->stk >= 4u );
     result  = pBuf[recv->stk++] << 24u;
diff --git a/modules/database/src/std/link/links.dbd.pod b/modules/database/src/std/link/links.dbd.pod
index 27689e321..93da47655 100644
--- a/modules/database/src/std/link/links.dbd.pod
+++ b/modules/database/src/std/link/links.dbd.pod
@@ -40,7 +40,7 @@ link(const, lnkConstIf)
 
 =head3 Constant Link C<"const">
 
-Constant links are input links that provide literal values at link initalization
+Constant links are input links that provide literal values at link initialization
 time, but do not return any data when their C<getValue()> routine is called.
 Most record types support the use of constant links on their input links by
 calling C<recGblInitConstantLink()> at record initialization, which results in
diff --git a/modules/database/src/std/rec/aSubRecord.dbd.pod b/modules/database/src/std/rec/aSubRecord.dbd.pod
index 14676b996..d771322eb 100644
--- a/modules/database/src/std/rec/aSubRecord.dbd.pod
+++ b/modules/database/src/std/rec/aSubRecord.dbd.pod
@@ -338,7 +338,7 @@ during record processing.
 
 =head3 Input Value Fields
 
-Thse fields hold the scalar or array values fetched through the input links
+These fields hold the scalar or array values fetched through the input links
 INPA,...,INPU.
 
 =fields A - U
diff --git a/modules/database/src/std/rec/aiRecord.c b/modules/database/src/std/rec/aiRecord.c
index 72a4c61f5..2340720f1 100644
--- a/modules/database/src/std/rec/aiRecord.c
+++ b/modules/database/src/std/rec/aiRecord.c
@@ -113,7 +113,7 @@ static long init_record(struct dbCommon *pcommon, int pass)
         return(S_dev_missingSup);
     }
     prec->init = TRUE;
-    /*The following is for old device support that doesnt know about eoff*/
+    /*The following is for old device support that doesn't know about eoff*/
     if ((prec->eslo==1.0) && (prec->eoff==0.0)) {
         prec->eoff = prec->egul;
     }
diff --git a/modules/database/src/std/rec/aoRecord.c b/modules/database/src/std/rec/aoRecord.c
index 333a80c4e..b006f114b 100644
--- a/modules/database/src/std/rec/aoRecord.c
+++ b/modules/database/src/std/rec/aoRecord.c
@@ -118,7 +118,7 @@ static long init_record(struct dbCommon *pcommon, int pass)
         return(S_dev_missingSup);
     }
     prec->init = TRUE;
-    /*The following is for old device support that doesnt know about eoff*/
+    /*The following is for old device support that doesn't know about eoff*/
     if ((prec->eslo==1.0) && (prec->eoff==0.0)) {
         prec->eoff = prec->egul;
     }
diff --git a/modules/database/src/std/rec/aoRecord.dbd.pod b/modules/database/src/std/rec/aoRecord.dbd.pod
index 6ae436d67..6b81e3d48 100644
--- a/modules/database/src/std/rec/aoRecord.dbd.pod
+++ b/modules/database/src/std/rec/aoRecord.dbd.pod
@@ -224,8 +224,8 @@ alarms that are common to all record types.
 These parameters are used to specify deadbands for monitors on the VAL
 field. The monitors are sent when the value field exceeds the last
 monitored field by the specified deadband. If these fields have a value
-of zero, everytime the value changes, a monitor will be triggered; if
-they have a value of -1, everytime the record is processed, monitors
+of zero, every time the value changes, a monitor will be triggered; if
+they have a value of -1, every time the record is processed, monitors
 are triggered. ADEL is the deadband for archive monitors, and MDEL the
 deadband for all other types of monitors. See Monitor Specification for
 a complete explanation of monitors.
diff --git a/modules/database/src/std/rec/biRecord.dbd.pod b/modules/database/src/std/rec/biRecord.dbd.pod
index b46c21f65..2b772b5e3 100644
--- a/modules/database/src/std/rec/biRecord.dbd.pod
+++ b/modules/database/src/std/rec/biRecord.dbd.pod
@@ -99,7 +99,7 @@ These parameters are used to determine if the binary input is in alarm
 condition and to determine the severity of that condition. The possible
 alarm conditions for binary inputs are the SCAN, READ state alarms, and the
 change of state alarm. The SCAN and READ alarms are called by the device
-supprt routines.
+support routines.
 
 The user can choose the severity of each state in the ZSV and OSV fields.
 The possible values for these fields are C<NO_ALARM>, C<MINOR>, and
@@ -126,7 +126,7 @@ MASK is given a value by ithe device support routines. This value is used to
 manipulate the record's value, but is only the concern of the hardware device
 support routines.
 
-The LALM fields holds the value of the last occurence of the change of
+The LALM fields holds the value of the last occurrence of the change of
 state alarm. It is used to implement the change of state alarm, and thus
 only has meaning if COSV is MAJOR or MINOR.
 
@@ -407,7 +407,7 @@ Scan forward link if necessary, set PACT FALSE, and return.
 =head3 Fields of Interest to Device Support
 
 Each binary input record must have an associated set of device support
-routines. The primary resposibility of the device support routines is to
+routines. The primary responsibility of the device support routines is to
 obtain a new raw input value whenever C<read_bi()> is called. The device
 support routines are primarily interested in the following fields:
 
diff --git a/modules/database/src/std/rec/boRecord.dbd.pod b/modules/database/src/std/rec/boRecord.dbd.pod
index 84f22024f..89e3e6c52 100644
--- a/modules/database/src/std/rec/boRecord.dbd.pod
+++ b/modules/database/src/std/rec/boRecord.dbd.pod
@@ -391,7 +391,7 @@ If either device support or the device support write routine does not
 exist, and error message is issued and processing is terminated.
 
 If DOL is a constant, then VAL is initialized to 1 if its value is nonzero
-or initialzed to 0 if DOL is zero, and UDF is set to FALSE.
+or initialized to 0 if DOL is zero, and UDF is set to FALSE.
 
 If device support includes C<init_record()>, it is called. VAL is set using
 RVAL, and UDF is set to FALSE.
diff --git a/modules/database/src/std/rec/calcRecord.dbd.pod b/modules/database/src/std/rec/calcRecord.dbd.pod
index d51f1408b..5bbfb6641 100644
--- a/modules/database/src/std/rec/calcRecord.dbd.pod
+++ b/modules/database/src/std/rec/calcRecord.dbd.pod
@@ -442,7 +442,7 @@ Result is C<E> if C<<< (A + B)<(C + D) >>>
 =item *
 Result is unchanged if C<<< (A + B)>=(C + D) >>>
 
-From 3.14.9 onwards, this expresion must be written as
+From 3.14.9 onwards, this expression must be written as
 C<<< (A + B) < (C + D) ? E : VAL >>>
 
 =back
@@ -537,8 +537,8 @@ These paramaeters are used to determine when to send monitors for the value
 fields. These monitors are sent when the value field exceeds the last
 monitored field by the appropriate deadband, the ADEL for archiver monitors
 and the MDEL field for all other types of monitors. If these fields have a
-value of zero, everytime the value changes, monitors are triggered; if they have a
-value of -1, everytime the record is scanned, monitors are triggered. See
+value of zero, every time the value changes, monitors are triggered; if they have a
+value of -1, every time the record is scanned, monitors are triggered. See
 L<Monitor Specification> for a complete explanation of monitors.
 
 =fields ADEL, MDEL
diff --git a/modules/database/src/std/rec/compressRecord.dbd.pod b/modules/database/src/std/rec/compressRecord.dbd.pod
index f2ea5100c..f64cfd896 100644
--- a/modules/database/src/std/rec/compressRecord.dbd.pod
+++ b/modules/database/src/std/rec/compressRecord.dbd.pod
@@ -121,7 +121,7 @@ holds the average of the first element of INP over N samples, VAL[1] holds the
 average of the next element of INP over N samples, and so on. The following
 shows the equation:
 
-=for comment Latex form of equation bellow : VAL[i] \leftarrow \frac{1}{N}\sum_{n=1}^NINP_{n}[i]
+=for comment Latex form of equation below : VAL[i] \leftarrow \frac{1}{N}\sum_{n=1}^NINP_{n}[i]
 
 =begin html
 
diff --git a/modules/database/src/std/rec/dfanoutRecord.dbd.pod b/modules/database/src/std/rec/dfanoutRecord.dbd.pod
index 7d92d4c75..7afcf0a06 100644
--- a/modules/database/src/std/rec/dfanoutRecord.dbd.pod
+++ b/modules/database/src/std/rec/dfanoutRecord.dbd.pod
@@ -42,7 +42,7 @@ These fields are listed in L<Scan Fields|dbCommonRecord/Scan Fields>.
 =head3 Desired Output Parameters
 
 The data fanout record must specify where the desired output value
-originates, i.e., the data which is to be fowarded to the records in its
+originates, i.e., the data which is to be forwarded to the records in its
 output links. The output mode select (OMSL) field determines whether the
 output originates from another record or from run-time database access.
 When set to C<closed_loop>, the desired output is retrieved from the link
@@ -156,8 +156,8 @@ These parameters are used to determine when to send monitors placed on the
 VAL field. These monitors are sent when the value field exceeds the last
 monitored fields by the specified deadband, ADEL for archivers monitors and
 MDEL for all other types of monitors. If these fields have a value of zero,
-everytime the value changes, a monitor will be triggered; if they have a
-value of -1, everytime the record is scanned, monitors are triggered. See
+every time the value changes, a monitor will be triggered; if they have a
+value of -1, every time the record is scanned, monitors are triggered. See
 L<Monitor Specification> for a complete explanation of monitors.
 
 =fields ADEL, MDEL
@@ -165,7 +165,7 @@ L<Monitor Specification> for a complete explanation of monitors.
 =head3 Run-Time Parameters and Simulation Mode Parameters
 
 These parameters are used by the run-time code for processing the data
-fanout record. Ther are not configurable. They are used to implement the
+fanout record. They are not configurable. They are used to implement the
 hysteresis factors for monitor callbacks.
 
 =fields LALM, ALST, MLST
diff --git a/modules/database/src/std/rec/histogramRecord.dbd.pod b/modules/database/src/std/rec/histogramRecord.dbd.pod
index c23ae6550..82665172e 100644
--- a/modules/database/src/std/rec/histogramRecord.dbd.pod
+++ b/modules/database/src/std/rec/histogramRecord.dbd.pod
@@ -70,7 +70,7 @@ alarms that are common to all record types.
 
 The MDEL field implements the monitor count deadband. Only when MCNT is greater
 than the value given to MDEL are monitors triggered, MCNT being the number of
-counts since the last time the record was processed. If MDEL is -1, everytime
+counts since the last time the record was processed. If MDEL is -1, every time
 the record is processed, a monitor is triggered regardless.
 
 If SDEL is greater than 0, it causes a callback routine to be called. The number
diff --git a/modules/database/src/std/rec/longinRecord.dbd.pod b/modules/database/src/std/rec/longinRecord.dbd.pod
index 1cf425ab0..774508eaa 100644
--- a/modules/database/src/std/rec/longinRecord.dbd.pod
+++ b/modules/database/src/std/rec/longinRecord.dbd.pod
@@ -93,8 +93,8 @@ alarms that are common to all record types.
 These parameters are used to determine when to send monitors placed on the value
 field. The monitors are sent when the value field exceeds the last monitored
 field (see the next section) by the appropriate deadband. If these fields have a
-value of zero, everytime the value changes, a monitor will be triggered; if they
-have a value of -1, everytime the record is scanned, monitors are triggered. The
+value of zero, every time the value changes, a monitor will be triggered; if they
+have a value of -1, every time the record is scanned, monitors are triggered. The
 ADEL field is used by archive monitors and the MDEL field for all other types of
 monitors.
 
diff --git a/modules/database/src/std/rec/longoutRecord.dbd.pod b/modules/database/src/std/rec/longoutRecord.dbd.pod
index d9a2c6e3c..b78d4265c 100644
--- a/modules/database/src/std/rec/longoutRecord.dbd.pod
+++ b/modules/database/src/std/rec/longoutRecord.dbd.pod
@@ -312,9 +312,9 @@ to alarms that are common to all record types.
 
 These parameters are used to determine when to send monitors placed on the value
 field. The monitors are sent when the value field exceeds the last monitored
-field by the appropriate delta. If these fields have a value of zero, everytime
+field by the appropriate delta. If these fields have a value of zero, every time
 the value changes, a monitor will be triggered; if they have a value of -1,
-everytime the record is scanned, monitors are triggered. The ADEL field is the
+every time the record is scanned, monitors are triggered. The ADEL field is the
 delta for archive monitors, and the MDEL field is the delta for all other types
 of monitors. See L<Monitor Specification> for a complete explanation of
 monitors.
diff --git a/modules/database/src/std/rec/mbboDirectRecord.dbd.pod b/modules/database/src/std/rec/mbboDirectRecord.dbd.pod
index f0ae3d545..b7cff9e49 100644
--- a/modules/database/src/std/rec/mbboDirectRecord.dbd.pod
+++ b/modules/database/src/std/rec/mbboDirectRecord.dbd.pod
@@ -16,7 +16,7 @@ It can accept boolean values in its 32 bit fields (B0-B9, BA-BF, B10-B19 and
 B1A-B1F), and converts them to a 32-bit signed integer in VAL which is provided
 to the device support. A zero value in a bit field becomes a zero bit in VAL, a
 non-zero value in a bit field becomes a one bit in VAL, with B0 being the least
-signficant bit and B1F the MSB/sign bit.
+significant bit and B1F the MSB/sign bit.
 
 =recordtype mbboDirect
 
@@ -47,7 +47,7 @@ placed into the VAL field.
 
 When OMSL is set to C<<< supervisory >>>, the DOL field is ignored during
 processing and the contents of VAL are used. A value to be output may thus be
-written direcly into the VAL field from elsewhere as long as the record is in
+written directly into the VAL field from elsewhere as long as the record is in
 C<<< supervisory >>> mode.
 
 =fields OMSL, DOL, VAL
diff --git a/modules/database/src/std/rec/printfRecord.dbd.pod b/modules/database/src/std/rec/printfRecord.dbd.pod
index 9bb98b0cc..c32306dfd 100644
--- a/modules/database/src/std/rec/printfRecord.dbd.pod
+++ b/modules/database/src/std/rec/printfRecord.dbd.pod
@@ -36,7 +36,7 @@ These fields are described in L<Scan Fields|dbCommonRecord/Scan Fields>.
 The printf record must specify the desired output string with embedded format
 specifiers in the FMT field. Plain characters are copied directly to the output
 string. A pair of percent characters 'C<%%>' are converted into a single percent
-character in the output string. A single precent character 'C<%>' introduces a
+character in the output string. A single percent character 'C<%>' introduces a
 format specifier and is followed by zero or more of the standard C<printf()>
 format flags and modifiers:
 
diff --git a/modules/database/src/std/rec/selRecord.dbd.pod b/modules/database/src/std/rec/selRecord.dbd.pod
index 0988d721b..7937f7218 100644
--- a/modules/database/src/std/rec/selRecord.dbd.pod
+++ b/modules/database/src/std/rec/selRecord.dbd.pod
@@ -133,8 +133,8 @@ alarms that are common to all record types.
 These fields are configurable by the user. They are used as deadbands for the
 archiver and monitor calls for the VAL field. Unless, VAL changes by more than
 the value specified by each, then the respective monitors will not be called. If
-these fields have a value of zero, everytime the VAL changes, monitors are
-triggered; if they have a value of -1, everytime the record is processed,
+these fields have a value of zero, every time the VAL changes, monitors are
+triggered; if they have a value of -1, every time the record is processed,
 monitors are triggered.
 
 =fields ADEL, MDEL
diff --git a/modules/database/src/std/rec/subRecord.dbd.pod b/modules/database/src/std/rec/subRecord.dbd.pod
index 774664684..42545ca3f 100644
--- a/modules/database/src/std/rec/subRecord.dbd.pod
+++ b/modules/database/src/std/rec/subRecord.dbd.pod
@@ -100,8 +100,8 @@ field. The appropriate monitors are invoked when VAL differs from the values in
 the ALST and MLST run-time fields, i.e., when the value of VAL changes by more
 than the deadband specified in these fields. The ADEL and MDEL fields specify a
 minimum delta which the change must surpass before the value-change monitors are
-invoked. If these fields have a value of zero, everytime the value changes, a
-monitor will be triggered; if they have a value of -1, everytime the record is
+invoked. If these fields have a value of zero, every time the value changes, a
+monitor will be triggered; if they have a value of -1, every time the record is
 processed, monitors are triggered. The ADEL field is used by archive monitors
 and the MDEL field for all other types of monitors.
 
@@ -290,7 +290,7 @@ This example for a VxWorks IOC shows an asynchronous subroutine. It uses
 (actually misuses) fields A and B. Field A is taken as the number of seconds
 until asynchronous completion. Field B is a flag to decide if messages should be
 printed. Lets assume A E<gt> 0 and B = 1. The following sequence of actions will
-occcur:
+occur:
 
 =over
 
diff --git a/modules/database/src/std/softIoc/base.dbd b/modules/database/src/std/softIoc/base.dbd
index 564a83845..37cc1ad70 100644
--- a/modules/database/src/std/softIoc/base.dbd
+++ b/modules/database/src/std/softIoc/base.dbd
@@ -4,7 +4,7 @@
 # Fixed menus
 include "menuGlobal.dbd"
 
-# Modifyable menus
+# Modifiable menus
 include "menuConvert.dbd"
 include "menuScan.dbd"
 
diff --git a/modules/database/src/std/softIoc/softMain.cpp b/modules/database/src/std/softIoc/softMain.cpp
index 0c45975b0..a44cb7151 100644
--- a/modules/database/src/std/softIoc/softMain.cpp
+++ b/modules/database/src/std/softIoc/softMain.cpp
@@ -72,7 +72,7 @@ void usage(const char *arg0, const std::string& base_dbd) {
                "    -D <dbd>  If used, must come first. Specify the path to the softIoc.dbdfile."
                "        The compile-time install location is saved in the binary as a default.\n"
                "\n"
-               "    -h  Print this mesage and exit.\n"
+               "    -h  Print this message and exit.\n"
                "\n"
                "    -S  Prevents an interactive shell being started.\n"
                "\n"
diff --git a/modules/database/src/tools/dbdToHtml.pl b/modules/database/src/tools/dbdToHtml.pl
index aecb9b481..9005d3ee3 100644
--- a/modules/database/src/tools/dbdToHtml.pl
+++ b/modules/database/src/tools/dbdToHtml.pl
@@ -405,7 +405,7 @@ field tables that refer to a locally-defined menu will generate a link to a
 document section which must be titled "Menu [menuName]".
 
 The "title" keyword should only appear once in each file, it sets the document
-title as well as generating a "head1" heading with "EPICS Reference:" pre-pended
+title as well as generating a "head1" heading with "EPICS Reference:" prepended
 to the text.
 
 =cut
diff --git a/modules/database/test/ioc/db/dbPutLinkTest.c b/modules/database/test/ioc/db/dbPutLinkTest.c
index a53214f6d..16968e975 100644
--- a/modules/database/test/ioc/db/dbPutLinkTest.c
+++ b/modules/database/test/ioc/db/dbPutLinkTest.c
@@ -98,7 +98,7 @@ static void testLinkParse(void)
         if (td->info.target && info.target)
             testStrcmp(0, info.target, td->info.target);
         else if(!!td->info.target ^ !!info.target)
-            testFail("info target NULL mis-match %s %s", info.target, td->info.target);
+            testFail("info target NULL mismatch %s %s", info.target, td->info.target);
         else
             testPass("info target NULL as expected");
         if (info.ltype == td->info.ltype) {
diff --git a/modules/database/test/ioc/db/dbStaticTestAliasAgainError1.db b/modules/database/test/ioc/db/dbStaticTestAliasAgainError1.db
index 150c09e20..e8dd43370 100644
--- a/modules/database/test/ioc/db/dbStaticTestAliasAgainError1.db
+++ b/modules/database/test/ioc/db/dbStaticTestAliasAgainError1.db
@@ -1,2 +1,2 @@
-# ERROR: alias using name of exising alias for different record
+# ERROR: alias using name of existing alias for different record
 alias("testrec", "testaliasAgain1")
diff --git a/modules/database/test/ioc/db/dbStaticTestAliasAgainError2.db b/modules/database/test/ioc/db/dbStaticTestAliasAgainError2.db
index 0fb844777..bb74f7e64 100644
--- a/modules/database/test/ioc/db/dbStaticTestAliasAgainError2.db
+++ b/modules/database/test/ioc/db/dbStaticTestAliasAgainError2.db
@@ -1,2 +1,2 @@
-# ERROR: alias using name of exising record fails
+# ERROR: alias using name of existing record fails
 alias("testrecAgain", "testrec")
diff --git a/modules/database/test/ioc/db/dbStaticTestRemove.db b/modules/database/test/ioc/db/dbStaticTestRemove.db
index 21304bf4c..ae79d3573 100644
--- a/modules/database/test/ioc/db/dbStaticTestRemove.db
+++ b/modules/database/test/ioc/db/dbStaticTestRemove.db
@@ -35,7 +35,7 @@ record(x, "testdelrec8") {
 }
 
 record("#", "no:such:record") { }
-record("#", "also:non:existant") {
+record("#", "also:non:existent") {
     field(FOO, "5")
 }
 
diff --git a/modules/database/test/ioc/db/devx.c b/modules/database/test/ioc/db/devx.c
index 66cbb74f5..0866e29f3 100644
--- a/modules/database/test/ioc/db/devx.c
+++ b/modules/database/test/ioc/db/devx.c
@@ -60,7 +60,7 @@ xdrv *xdrv_get(int group)
             return curd;
         }
     }
-    cantProceed("xdrv_get() for non-existant group");
+    cantProceed("xdrv_get() for non-existent group");
     return NULL;
 }
 
diff --git a/modules/database/test/std/rec/asyncproctest.db b/modules/database/test/std/rec/asyncproctest.db
index 87fe5d63d..2a41fcfae 100644
--- a/modules/database/test/std/rec/asyncproctest.db
+++ b/modules/database/test/std/rec/asyncproctest.db
@@ -14,7 +14,7 @@ record(sub, "done1") {
 
 
 # original problem case
-# async record chained after syncronous record
+# async record chained after synchronous record
 record(calcout, "chain2:1") {
     field(CALC, "A:=A+1;B")
     # ODLY=0 synchronous
diff --git a/modules/database/test/std/rec/boTest.c b/modules/database/test/std/rec/boTest.c
index 55865c79c..1ea42733a 100644
--- a/modules/database/test/std/rec/boTest.c
+++ b/modules/database/test/std/rec/boTest.c
@@ -53,7 +53,7 @@ static void test_high(void){
     /* set VAL to process record */
     testdbPutFieldOk("test_bo_rec.VAL", DBF_SHORT, TRUE);
 
-    /* wait and verfiy time */
+    /* wait and verify time */
     testMonitorWait(test_mon);
     epicsTimeGetCurrent(&endTime);
 
diff --git a/modules/libcom/RTEMS/posix/rtems_init.c b/modules/libcom/RTEMS/posix/rtems_init.c
index 0af4fa78f..f75ab33de 100644
--- a/modules/libcom/RTEMS/posix/rtems_init.c
+++ b/modules/libcom/RTEMS/posix/rtems_init.c
@@ -1018,7 +1018,7 @@ POSIX_Init ( void *argument __attribute__((unused)))
 #if defined(QEMU_FIXUPS) && defined(__i386__)
     // glorious hack to stub out useless EEPROM check
     // which takes sooooo longggg w/ QEMU
-    // Writes a 'ret' instruction to immediatly return to the caller
+    // Writes a 'ret' instruction to immediately return to the caller
     extern void _bsd_e1000_validate_nvm_checksum(void);
     *(char*)&_bsd_e1000_validate_nvm_checksum = 0xc3;
 #endif
diff --git a/modules/libcom/src/calc/calcPerform.c b/modules/libcom/src/calc/calcPerform.c
index 8678a573d..340078f82 100644
--- a/modules/libcom/src/calc/calcPerform.c
+++ b/modules/libcom/src/calc/calcPerform.c
@@ -40,7 +40,7 @@ static int cond_search(const char **ppinst, int match);
 
 /* calcPerform
  *
- * Evalutate the postfix expression
+ * Evaluate the postfix expression
  */
 LIBCOM_API long
     calcPerform(double *parg, double *presult, const char *pinst)
diff --git a/modules/libcom/src/calc/postfix.c b/modules/libcom/src/calc/postfix.c
index 2bc3e121e..111331d5b 100644
--- a/modules/libcom/src/calc/postfix.c
+++ b/modules/libcom/src/calc/postfix.c
@@ -42,7 +42,7 @@ typedef enum {
         UNARY_OPERATOR,
         VARARG_OPERATOR,
         BINARY_OPERATOR,
-        SEPERATOR,
+        SEPARATOR,
         CLOSE_PAREN,
         CONDITIONAL,
         EXPR_TERMINATOR,
@@ -155,7 +155,7 @@ static const ELEMENT operators[] = {
 {"*",           5, 5,   -1,     BINARY_OPERATOR,MULT},
 {"**",          6, 6,   -1,     BINARY_OPERATOR,POWER},
 {"+",           4, 4,   -1,     BINARY_OPERATOR,ADD},
-{",",           0, 0,   0,      SEPERATOR,      NOT_GENERATED},
+{",",           0, 0,   0,      SEPARATOR,      NOT_GENERATED},
 {"-",           4, 4,   -1,     BINARY_OPERATOR,SUB},
 {"/",           5, 5,   -1,     BINARY_OPERATOR,DIV},
 {":",           0, 0,   -1,     CONDITIONAL,    COND_ELSE},
@@ -343,7 +343,7 @@ LIBCOM_API long
             operand_needed = TRUE;
             break;
 
-        case SEPERATOR:
+        case SEPARATOR:
             if (pstacktop == stack) {
                 *perror = CALC_ERR_BAD_SEPERATOR;
                 goto bad;
diff --git a/modules/libcom/src/calc/postfix.h b/modules/libcom/src/calc/postfix.h
index 1e945252c..4e568f5ac 100644
--- a/modules/libcom/src/calc/postfix.h
+++ b/modules/libcom/src/calc/postfix.h
@@ -323,7 +323,7 @@ LIBCOM_API long
 
 /** \brief Run the calculation engine
  *
- * Evaluates the postfix expression against a set ot input values.
+ * Evaluates the postfix expression against a set of input values.
  *
  * \param parg Pointer to an array of double values for the arguments
  * \c A-U that can appear in the expression.
diff --git a/modules/libcom/src/cxxTemplates/resourceLib.h b/modules/libcom/src/cxxTemplates/resourceLib.h
index 28aca6f59..3b2bd2bfe 100644
--- a/modules/libcom/src/cxxTemplates/resourceLib.h
+++ b/modules/libcom/src/cxxTemplates/resourceLib.h
@@ -423,7 +423,7 @@ void resTable<T,ID>::show ( unsigned level ) const
             mean, stdDev, maxEntries );
         printf("%u empty buckets\n", empty);
         if ( X != this->nInUse ) {
-            printf ("this->nInUse didnt match items counted which was %f????\n", X );
+            printf ("this->nInUse didn't match items counted which was %f????\n", X );
         }
     }
 }
@@ -1140,7 +1140,7 @@ stringId::~stringId()
             //
             // the HP-UX compiler gives us a warning on
             // each cast away of const, but in this case
-            // it cant be avoided.
+            // it can't be avoided.
             //
             // The DEC compiler complains that const isn't
             // really significant in a cast if it is present.
diff --git a/modules/libcom/src/dbmf/dbmf.c b/modules/libcom/src/dbmf/dbmf.c
index 0a14f8919..7dd7a68c4 100644
--- a/modules/libcom/src/dbmf/dbmf.c
+++ b/modules/libcom/src/dbmf/dbmf.c
@@ -78,7 +78,7 @@ int dbmfInit(size_t size, int chunkItems)
     pdbmfPvt = &dbmfPvt;
     ellInit(&pdbmfPvt->chunkList);
     pdbmfPvt->lock = epicsMutexMustCreate();
-    /*allign to at least a double*/
+    /*align to at least a double*/
     pdbmfPvt->size = size + size%sizeof(double);
     /* layout is
      * | itemHeader | REDZONE | size | REDZONE |
diff --git a/modules/libcom/src/env/envDefs.h b/modules/libcom/src/env/envDefs.h
index bd0212a6f..ae03ec1d7 100644
--- a/modules/libcom/src/env/envDefs.h
+++ b/modules/libcom/src/env/envDefs.h
@@ -82,7 +82,7 @@ LIBCOM_API extern const ENV_PARAM EPICS_ALLOW_POSIX_THREAD_PRIORITY_SCHEDULING;
  *
  * A NULL terminated array of all ENV_PARAM known to EPICS Base.
  * This array is assembled during the EPICS Base build, and
- * contains at least the preceeding parameters.
+ * contains at least the preceding parameters.
  */
 LIBCOM_API extern const ENV_PARAM *env_param_list[];
 
diff --git a/modules/libcom/src/error/errSymTbl.h b/modules/libcom/src/error/errSymTbl.h
index 1b39ff6f3..65e448e27 100644
--- a/modules/libcom/src/error/errSymTbl.h
+++ b/modules/libcom/src/error/errSymTbl.h
@@ -45,7 +45,7 @@ extern "C" {
  *
  * Handles EPICS message codes, and "errno" codes.
  *
- * Copies in a mesage for any status code.  Unknown status codes
+ * Copies in a message for any status code.  Unknown status codes
  * are printed numerically.
  */
 LIBCOM_API void errSymLookup(long status, char *pBuf, size_t bufLength);
@@ -65,7 +65,7 @@ LIBCOM_API void errSymTest(epicsUInt16 modnum, epicsUInt16 begErrNum,
 LIBCOM_API void errSymTestPrint(long errNum);
 LIBCOM_API int errSymBld(void);
 /** @brief Define new custom error code and associate message string.
- *  @param errNum New error code.  Caller is reponsible for avoiding reuse of existing codes.
+ *  @param errNum New error code.  Caller is responsible for avoiding reuse of existing codes.
  *  @param message New message.  Pointer stored.  Caller must not free pointed storage.
  *  @return 0 on success
  */
diff --git a/modules/libcom/src/fdmgr/fdmgr.h b/modules/libcom/src/fdmgr/fdmgr.h
index b0341094f..ff815113c 100644
--- a/modules/libcom/src/fdmgr/fdmgr.h
+++ b/modules/libcom/src/fdmgr/fdmgr.h
@@ -71,7 +71,7 @@ LIBCOM_API fdctx * epicsStdCall fdmgr_init(void);
  * Specify a function to be called with a specified parameter
  * after a specified delay relative to the current time
  *
- * Returns fdmgrNoAlarm (zero) if alarm cant be created
+ * Returns fdmgrNoAlarm (zero) if alarm can't be created
  */
 #define fdmgrNoAlarm 0
 LIBCOM_API fdmgrAlarmId epicsStdCall fdmgr_add_timeout(
diff --git a/modules/libcom/src/flex/Changes b/modules/libcom/src/flex/Changes
index 0111a1f21..959a84d6f 100644
--- a/modules/libcom/src/flex/Changes
+++ b/modules/libcom/src/flex/Changes
@@ -41,7 +41,7 @@ Changes between 2.3 Patch #2 (02Aug90) and original 2.3 release:
 	  Reordered #ifdef maze in the scanner skeleton in the hope of
 	  getting the declarations right for cfront and g++, too.
 
-	- Note that this patch supercedes patch #1 for release 2.3,
+	- Note that this patch supersedes patch #1 for release 2.3,
 	  which was never announced but was available briefly for
 	  anonymous ftp.
 
@@ -56,7 +56,7 @@ Changes between 2.3 (full) release of 28Jun90 and 2.2 (alpha) release:
 	  given.  To specify an end-of-file action for just the initial
 	  state, use <INITIAL><<EOF>>.
 
-	- -d debug output is now contigent on the global yy_flex_debug
+	- -d debug output is now contingent on the global yy_flex_debug
 	  being set to a non-zero value, which it is by default.
 
 	- A new macro, YY_USER_INIT, is provided for the user to specify
@@ -99,7 +99,7 @@ Changes between 2.3 (full) release of 28Jun90 and 2.2 (alpha) release:
 	- yy_switch_to_buffer() can be used in the yywrap() macro/routine.
 
 	- flex scanners do not use stdio for their input, and hence when
-	  writing an interactive scanner one must explictly call fflush()
+	  writing an interactive scanner one must explicitly call fflush()
 	  after writing out a prompt.
 
 	- flex scanner can be made reentrant (after a fashion) by using
diff --git a/modules/libcom/src/flex/flex.html b/modules/libcom/src/flex/flex.html
index 3b6ae9b80..aac0f2db4 100644
--- a/modules/libcom/src/flex/flex.html
+++ b/modules/libcom/src/flex/flex.html
@@ -341,7 +341,7 @@
 
      -    yy_create_buffer( file, size ) takes a <I>FILE</I> pointer and
           an integer <I>size</I>. It returns a YY_BUFFER_STATE handle to
-          a new input buffer  large  enough  to  accomodate  <I>size</I>
+          a new input buffer  large  enough  to  accommodate  <I>size</I>
           characters and associated with the given file.  When in
           doubt, use YY_BUF_SIZE for the size.
 
diff --git a/modules/libcom/src/flex/flexdef.h b/modules/libcom/src/flex/flexdef.h
index e0822f367..7685764c9 100644
--- a/modules/libcom/src/flex/flexdef.h
+++ b/modules/libcom/src/flex/flexdef.h
@@ -602,7 +602,7 @@ extern void *reallocate_array(void *array, int size, int element_size);
 #define reallocate_character_array(array,size) \
     (Char *) reallocate_array( (void *) array, size, sizeof( Char ) )
 
-#if 0 /* JRW this might couse trouble... but not for IOC usage */
+#if 0 /* JRW this might cause trouble... but not for IOC usage */
 /* used to communicate between scanner and parser.  The type should really
  * be YYSTYPE, but we can't easily get our hands on it.
  */
@@ -710,7 +710,7 @@ extern void lerrsf (char[], char[]) NORETURN;
 /* spit out a "# line" statement */
 extern void line_directive_out (FILE*);
 
-/* generate a data statment for a two-dimensional array */
+/* generate a data statement for a two-dimensional array */
 extern void mk2data (int);
 
 /* generate a data statement */
diff --git a/modules/libcom/src/flex/tblcmp.c b/modules/libcom/src/flex/tblcmp.c
index 7b87e368f..fb9dd4160 100644
--- a/modules/libcom/src/flex/tblcmp.c
+++ b/modules/libcom/src/flex/tblcmp.c
@@ -500,7 +500,7 @@ void mkdeftbl(void)
  * (i.e., jam entries) into the table.  It is assumed that by linking to
  * "JAMSTATE" they will be taken care of.  In any case, entries in "state"
  * marking transitions to "SAME_TRANS" are treated as though they will be
- * taken care of by whereever "deflink" points.  "totaltrans" is the total
+ * taken care of by wherever "deflink" points.  "totaltrans" is the total
  * number of transitions out of the state.  If it is below a certain threshold,
  * the tables are searched for an interior spot that will accommodate the
  * state array.
diff --git a/modules/libcom/src/iocsh/initHooks.h b/modules/libcom/src/iocsh/initHooks.h
index 57a1cc1fc..bfe8caf5b 100644
--- a/modules/libcom/src/iocsh/initHooks.h
+++ b/modules/libcom/src/iocsh/initHooks.h
@@ -83,7 +83,7 @@ typedef enum {
     initHookAfterInitDatabase,      /**< Records and locksets init  (also autosave pass 1) */
     initHookAfterFinishDevSup,      /**< Device support init pass 1 */
     initHookAfterScanInit,          /**< Scan, AS, ProcessNotify init */
-    initHookAfterInitialProcess,    /**< Records with PINI = YES processsed */
+    initHookAfterInitialProcess,    /**< Records with PINI = YES processed */
     initHookAfterCaServerInit,      /**< RSRV init */
     initHookAfterIocBuilt,          /**< End of iocBuild() */
 
@@ -154,7 +154,7 @@ typedef enum {
 
 /** \brief Type for application callback functions
  *
- * Application callback functions must match this typdef.
+ * Application callback functions must match this typedef.
  * \param state initHook enumeration value
  */
 typedef void (*initHookFunction)(initHookState state);
diff --git a/modules/libcom/src/iocsh/iocsh.cpp b/modules/libcom/src/iocsh/iocsh.cpp
index 39bc493bb..d8a120c52 100644
--- a/modules/libcom/src/iocsh/iocsh.cpp
+++ b/modules/libcom/src/iocsh/iocsh.cpp
@@ -1513,7 +1513,7 @@ static const iocshArg *onArgs[1] = {&onArg0};
 static const iocshFuncDef onFuncDef = {"on", 1, onArgs,
                                        "Change IOC shell error handling.\n"
                                        "  continue (default) - Ignores error and continue with next commands.\n"
-                                       "  break - Return to caller without executing futher commands.\n"
+                                       "  break - Return to caller without executing further commands.\n"
                                        "  halt - Suspend process.\n"
                                        "  wait - stall process for <delay> seconds, then continue.\n"};
 static void onCallFunc(const iocshArgBuf *args)
diff --git a/modules/libcom/src/iocsh/iocsh.h b/modules/libcom/src/iocsh/iocsh.h
index 90a534581..07711c37f 100644
--- a/modules/libcom/src/iocsh/iocsh.h
+++ b/modules/libcom/src/iocsh/iocsh.h
@@ -13,7 +13,7 @@
 /**
  * @file iocsh.h
  * 
- * @brief C and C++ defintions of functions for IOC shell programming.
+ * @brief C and C++ definitions of functions for IOC shell programming.
  * 
  * @details
  * The iocsh API provides an interface for running commands in the shell
@@ -83,7 +83,7 @@ typedef enum {
 /**
  * @union iocshArgBuf
  * 
- * This union is used when building the func paramter of iocshRegister().
+ * This union is used when building the func parameter of iocshRegister().
  * Each use should match the parameter type of the parameters of the
  * function being registered
  * 
@@ -257,7 +257,7 @@ LIBCOM_API void epicsStdCall iocshFree(void);
 LIBCOM_API int epicsStdCall iocsh(const char *pathname);
 
 /**
- * @brief This function is used to exectute a single IOC shell command.
+ * @brief This function is used to execute a single IOC shell command.
  * 
  * @param cmd A string that represents the command to be executed.
  * @return 0 on success, non-zero on error
@@ -268,7 +268,7 @@ LIBCOM_API int epicsStdCall iocshCmd(const char *cmd);
 /**  
  * @brief Read and evaluate IOC shell commands from the given file.  A list of macros
  * can be supplied as a parameter.  These macros are treated as environment variables during
- * exectution of the file's commands.
+ * execution of the file's commands.
  * 
  * @param pathname A string that represents the path to a file from which commands are read.
  * @param macros NULL or a comma separated list of macro definitions.  eg. "VAR1=x,VAR2=y"
@@ -278,7 +278,7 @@ LIBCOM_API int epicsStdCall iocshLoad(const char *pathname, const char* macros);
 /** 
  * @brief Evaluate a single IOC shell command. A list of macros can be supplied
  * as a parameter.  These macros are treated as environment variables during
- * exectution of the command.
+ * execution of the command.
  * 
  * @param cmd Command string.  eg. "echo \"something or other\""
  * @param macros NULL or a comma separated list of macro definitions.  eg. "VAR1=x,VAR2=y"
diff --git a/modules/libcom/src/iocsh/libComRegister.c b/modules/libcom/src/iocsh/libComRegister.c
index fd7c232de..fd17acccb 100644
--- a/modules/libcom/src/iocsh/libComRegister.c
+++ b/modules/libcom/src/iocsh/libComRegister.c
@@ -215,7 +215,7 @@ static void registryDumpCallFunc(const iocshArgBuf *args)
 static const iocshFuncDef iocLogInitFuncDef = {"iocLogInit",0,0,
                                                "Initialize IOC logging\n"
                                                "  * EPICS environment variable 'EPICS_IOC_LOG_INET' has to be defined\n"
-                                               "  * Logging controled via 'iocLogDisable' variable\n"
+                                               "  * Logging controlled via 'iocLogDisable' variable\n"
                                                "       see 'setIocLogDisable' command\n"};
 static void iocLogInitCallFunc(const iocshArgBuf *args)
 {
diff --git a/modules/libcom/src/log/iocLogServer.c b/modules/libcom/src/log/iocLogServer.c
index 4eccb6a12..d3b7aeaf7 100644
--- a/modules/libcom/src/log/iocLogServer.c
+++ b/modules/libcom/src/log/iocLogServer.c
@@ -670,7 +670,7 @@ static void writeMessagesToLog (struct iocLogClient *pclient)
         }
         else {
             if (status != ntci) {
-                fprintf(stderr, "iocLogServer: didnt calculate number of characters correctly?\n");
+                fprintf(stderr, "iocLogServer: didn't calculate number of characters correctly?\n");
             }
             pclient->pserver->filePos += status;
         }
diff --git a/modules/libcom/src/macLib/macLib.h b/modules/libcom/src/macLib/macLib.h
index 629a2bac8..4ed7ead3c 100644
--- a/modules/libcom/src/macLib/macLib.h
+++ b/modules/libcom/src/macLib/macLib.h
@@ -71,7 +71,7 @@ epicsStdCall macCreateHandle(
 /**
  * \brief Disable or enable warning messages.
  *
- * The macExpandString() routine prints warnings when it cant expand a macro.
+ * The macExpandString() routine prints warnings when it can't expand a macro.
  * This routine can be used to silence those warnings. A non zero value will
  * suppress the warning messages from subsequent library routines given the
  * same \c handle.
diff --git a/modules/libcom/src/macLib/macLibREADME b/modules/libcom/src/macLib/macLibREADME
index f3cda53c2..9efcb9a20 100644
--- a/modules/libcom/src/macLib/macLibREADME
+++ b/modules/libcom/src/macLib/macLibREADME
@@ -28,7 +28,7 @@ a) long macCreateHandle( MAC_HANDLE **handle, char *pairs[] );
    routine.
 
    macSuppressWarning can be called to suppress the marning message
-   when macExpandString cant expand a macro. A non zero value will
+   when macExpandString can't expand a macro. A non zero value will
    suppress the messages.
 
 
@@ -125,7 +125,7 @@ a) macParseDefns( MAC_HANDLE  *handle, char *defns, char **pairs[] );
    significant within values but ignored elsewhere (i.e. surrounding "="
    and "," characters).
 
-   Probably noone will ever want to, but the special meanings of "$",
+   Probably no one will ever want to, but the special meanings of "$",
    "{", "}", "(", ")", "=" and "," can all be changed via macPutXxxx()
    calls.  This routine does not have a handle argument, so they must be
    changed globally for it to use the new definitions. Should it have a
diff --git a/modules/libcom/src/misc/adjustment.c b/modules/libcom/src/misc/adjustment.c
index 525394277..8b3497674 100644
--- a/modules/libcom/src/misc/adjustment.c
+++ b/modules/libcom/src/misc/adjustment.c
@@ -20,19 +20,19 @@
 
 size_t adjustToWorstCaseAlignment(size_t size)
 {
-    union aline {
-        /* largest primative types (so far...) */
+    union align {
+        /* largest primitive types (so far...) */
         double dval;
         size_t uval;
         char *ptr;
     };
 
     /* assert that alignment size is a power of 2 */
-    STATIC_ASSERT((sizeof(union aline) & (sizeof(union aline)-1))==0);
+    STATIC_ASSERT((sizeof(union align) & (sizeof(union align)-1))==0);
 
-    /* round up to aligment size */
+    /* round up to alignment size */
     size--;
-    size |= sizeof(union aline)-1;
+    size |= sizeof(union align)-1;
     size++;
 
     return size;
diff --git a/modules/libcom/src/misc/epicsString.h b/modules/libcom/src/misc/epicsString.h
index 834562760..1ccc61ac9 100644
--- a/modules/libcom/src/misc/epicsString.h
+++ b/modules/libcom/src/misc/epicsString.h
@@ -93,7 +93,7 @@ LIBCOM_API size_t epicsStrnEscapedFromRawSize(const char *buf, size_t len);
  */
 LIBCOM_API int epicsStrCaseCmp(const char *s1, const char *s2);
 
-/** \brief Does case-insensitive comparision of two strings
+/** \brief Does case-insensitive comparison of two strings
  *
  * Implements strncmp from the C standard library, except is case insensitive
  */
diff --git a/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp b/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp
index 43a7537b9..20f24937f 100644
--- a/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp
+++ b/modules/libcom/src/misc/ipAddrToAsciiAsynchronous.cpp
@@ -155,7 +155,7 @@ void ipAddrToAsciiEngine::cleanup()
     ipAddrToAsciiEnginePrivate::pEngine = 0;
 }
 
-// for now its probably sufficent to allocate one
+// for now its probably sufficient to allocate one
 // DNS transaction thread for all codes sharing
 // the same process that need DNS services but we
 // leave our options open for the future
diff --git a/modules/libcom/src/osi/TODOfuture b/modules/libcom/src/osi/TODOfuture
index 661459eeb..6bf9d9d82 100644
--- a/modules/libcom/src/osi/TODOfuture
+++ b/modules/libcom/src/osi/TODOfuture
@@ -7,7 +7,7 @@ is like the vxWorks sysClockRateGet().
 
 
 The implementation should be:
-    Provide a default that determines the rate emperically at int time by
+    Provide a default that determines the rate empirically at int time by
     calling epicsThreadSleep for amaller and smaller delays until the actual
     delay no longer decreases.
     Each os/xxx can override the default if desired.
diff --git a/modules/libcom/src/osi/devLibVME.h b/modules/libcom/src/osi/devLibVME.h
index 87d172a8a..96883bcf8 100644
--- a/modules/libcom/src/osi/devLibVME.h
+++ b/modules/libcom/src/osi/devLibVME.h
@@ -11,7 +11,7 @@
 /**
  * \file devLibVME.h
  * \author Marty Kraimer, Jeff Hill
- * \brief API for accessing hardware devices, mosty over VMEbus.
+ * \brief API for accessing hardware devices, mostly over VMEbus.
  *
  * API for accessing hardware devices. The original APIs here were for
  * written for use with VMEbus but additional routines were added for
diff --git a/modules/libcom/src/osi/epicsAtomic.h b/modules/libcom/src/osi/epicsAtomic.h
index ed2422a3d..414200715 100644
--- a/modules/libcom/src/osi/epicsAtomic.h
+++ b/modules/libcom/src/osi/epicsAtomic.h
@@ -18,12 +18,12 @@
  *
  * These primitives can be safely used in a multithreaded programs on symmetric multiprocessing (SMP) 
  * systems. Where possible the primitives are implemented with compiler intrinsic wrappers for architecture 
- * specific instructions. Otherwise they are implemeted with OS specific functions and otherwise, when lacking
+ * specific instructions. Otherwise they are implemented with OS specific functions and otherwise, when lacking
  *  a sufficently capable OS specific interface, then in some rare situations a mutual exclusion primitive is 
  * used for synchronization.
  *
  * In operating systems environments which allow C code to run at interrupt level the implementation must 
- * use interrupt level invokable CPU instruction primitives.
+ * use interrupt level invocable CPU instruction primitives.
  *
  * All C++ functions are implemented in the namespace atomics which is nested inside of namespace epics. 
  */
diff --git a/modules/libcom/src/osi/epicsEndian.h b/modules/libcom/src/osi/epicsEndian.h
index 7c39bdebe..f9111558f 100644
--- a/modules/libcom/src/osi/epicsEndian.h
+++ b/modules/libcom/src/osi/epicsEndian.h
@@ -25,11 +25,11 @@
 #include "osdWireConfig.h"
 
 #ifndef EPICS_BYTE_ORDER
-#error osdWireConfig.h didnt define EPICS_BYTE_ORDER
+#error osdWireConfig.h did not define EPICS_BYTE_ORDER
 #endif
 
 #ifndef EPICS_FLOAT_WORD_ORDER
-#error osdWireConfig.h didnt define EPICS_FLOAT_WORD_ORDER
+#error osdWireConfig.h did not define EPICS_FLOAT_WORD_ORDER
 #endif
 
 #endif /* INC_epicsEndian_H */
diff --git a/modules/libcom/src/osi/epicsMutex.cpp b/modules/libcom/src/osi/epicsMutex.cpp
index a97de6067..aef0ec004 100644
--- a/modules/libcom/src/osi/epicsMutex.cpp
+++ b/modules/libcom/src/osi/epicsMutex.cpp
@@ -13,7 +13,7 @@
 /*
  * NOTES:
  * 1) LOG_LAST_OWNER feature is normally commented out because
- * it slows down the system at run time, anfd because its not
+ * it slows down the system at run time, and because it's not
  * currently safe to convert a thread id to a thread name because
  * the thread may have exited making the thread id invalid.
  */
diff --git a/modules/libcom/src/osi/epicsTime.h b/modules/libcom/src/osi/epicsTime.h
index bb75dd56b..f6bfe7603 100644
--- a/modules/libcom/src/osi/epicsTime.h
+++ b/modules/libcom/src/osi/epicsTime.h
@@ -120,7 +120,7 @@ LIBCOM_API int epicsTimeGetMonotonic ( epicsTimeStamp * pDest );
 /** \name ISR-callable
  * These routines may be called from an Interrupt Service Routine, and
  * will return a value from the last current time or event time provider
- * that sucessfully returned a result from the equivalent non-ISR routine.
+ * that successfully returned a result from the equivalent non-ISR routine.
  * @{
  */
 /** \brief Get current time into \p *pDest (ISR-safe) */
diff --git a/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c b/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c
index a81d7169a..83e6c3d0a 100644
--- a/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c
+++ b/modules/libcom/src/osi/os/RTEMS-score/devLibVMEOSD.c
@@ -362,7 +362,7 @@ static int rtemsDevInterruptInUseVME (unsigned vectorNumber)
         return FALSE;
 
     /*
-     * its a C routine. Does it match a default handler?
+     * it's a C routine. Does it match a default handler?
      */
     for (i=0; i<NELEMENTS(defaultHandlerAddr); i++) {
         if (defaultHandlerAddr[i] == psub) {
diff --git a/modules/libcom/src/osi/os/WIN32/epicsTempFile.c b/modules/libcom/src/osi/os/WIN32/epicsTempFile.c
index 1a01477ea..e4a5ce65f 100644
--- a/modules/libcom/src/osi/os/WIN32/epicsTempFile.c
+++ b/modules/libcom/src/osi/os/WIN32/epicsTempFile.c
@@ -35,7 +35,7 @@ LIBCOM_API FILE * epicsStdCall epicsTempFile ()
          * condition where two programs end up receiving the
          * same temporary file name.
          *
-         * _O_CREAT create if non-existant
+         * _O_CREAT create if non-existent
          * _O_EXCL file must not exist
          * _O_RDWR read and write the file
          * _O_TEMPORARY delete file on close
diff --git a/modules/libcom/src/osi/os/WIN32/osdThread.c b/modules/libcom/src/osi/os/WIN32/osdThread.c
index d95c9971b..81f1b79be 100644
--- a/modules/libcom/src/osi/os/WIN32/osdThread.c
+++ b/modules/libcom/src/osi/os/WIN32/osdThread.c
@@ -41,7 +41,7 @@
  * prototypes only appear in the windows SDK 8 and above.
  * VS2010 supplies sdk 7, but can be upgraded to later SDK 
 
- * To accomodate this we suuply prototypes on, for XP
+ * To accommodate this we supply prototypes on, for XP
  * fall back to Tls*() which will build and run
  * correctly for epicsThreads, but means that TLS allocations from
  * epicsThreadImplicitCreate() will continue to leak (for non-EPICS threads).
@@ -49,13 +49,13 @@
  * Also, WINE circa 5.0.3 provides the FLS storage functions, but doesn't
  * actually run the dtor function.
  *
- * we check for existance of _WIN32_WINNT_WIN8 which will only be defined
+ * we check for existence of _WIN32_WINNT_WIN8 which will only be defined
  * in SDK 8 and above. If Visa is detected and SDK < 8 we will supply
  * the missing prototypes
  */
 
 #if _WIN32_WINNT >= 0x0600 /* VISTA */
-#   ifdef _WIN32_WINNT_WIN8 /* Existance means using SDK 8 or higher */
+#   ifdef _WIN32_WINNT_WIN8 /* Existence means using SDK 8 or higher */
 #       include <fibersapi.h>
 #   else
 #       include <winnt.h> /* for PFLS_CALLBACK_FUNCTION */
diff --git a/modules/libcom/src/osi/os/WIN32/osdTime.cpp b/modules/libcom/src/osi/os/WIN32/osdTime.cpp
index 0916b6c9f..92edeed81 100644
--- a/modules/libcom/src/osi/os/WIN32/osdTime.cpp
+++ b/modules/libcom/src/osi/os/WIN32/osdTime.cpp
@@ -86,7 +86,7 @@ private:
     bool threadHasExited;
     void updatePLL ();
     static const int pllDelay; /* integer seconds */
-    // cant be static because of diff btw __stdcall and __cdecl
+    // can't be static because of diff btw __stdcall and __cdecl
     friend unsigned __stdcall _pllThreadEntry ( void * pCurrentTimeIn );
 };
 
diff --git a/modules/libcom/src/osi/os/default/osdWireConfig.h b/modules/libcom/src/osi/os/default/osdWireConfig.h
index aa6a6871f..f124307ca 100644
--- a/modules/libcom/src/osi/os/default/osdWireConfig.h
+++ b/modules/libcom/src/osi/os/default/osdWireConfig.h
@@ -17,7 +17,7 @@
 
 /* This file must be usable from both C and C++ */
 
-/* if compilation fails because this wasnt found then you may need to define an OS
+/* if compilation fails because this wasn't found then you may need to define an OS
    specific osdWireConfig.h */
 #include <sys/param.h>
 
@@ -27,7 +27,7 @@
 #   elif __BYTE_ORDER == __BIG_ENDIAN
 #       define EPICS_BYTE_ORDER EPICS_ENDIAN_BIG
 #   else
-#       error EPICS hasnt been ported to run on the <sys/param.h> specified __BYTE_ORDER
+#       error EPICS has not been ported to run on the <sys/param.h> specified __BYTE_ORDER
 #   endif
 #else
 #   ifdef BYTE_ORDER
@@ -36,10 +36,10 @@
 #       elif BYTE_ORDER == BIG_ENDIAN
 #           define EPICS_BYTE_ORDER EPICS_ENDIAN_BIG
 #       else
-#           error EPICS hasnt been ported to run on the <sys/param.h> specified BYTE_ORDER
+#           error EPICS has not been ported to run on the <sys/param.h> specified BYTE_ORDER
 #       endif
 #   else
-#       error <sys/param.h> doesnt specify __BYTE_ORDER or BYTE_ORDER - is an OS specific osdWireConfig.h needed?
+#       error <sys/param.h> does not specify __BYTE_ORDER or BYTE_ORDER - is an OS specific osdWireConfig.h needed?
 #   endif
 #endif
 
@@ -49,7 +49,7 @@
 #   elif __FLOAT_WORD_ORDER == __BIG_ENDIAN
 #       define EPICS_FLOAT_WORD_ORDER EPICS_ENDIAN_BIG
 #   else
-#       error EPICS hasnt been ported to <sys/param.h> specified __FLOAT_WORD_ORDER
+#       error EPICS has not been ported to <sys/param.h> specified __FLOAT_WORD_ORDER
 #   endif
 #else
 #    ifdef FLOAT_WORD_ORDER
@@ -58,7 +58,7 @@
 #       elif FLOAT_WORD_ORDER == BIG_ENDIAN
 #           define EPICS_FLOAT_WORD_ORDER EPICS_ENDIAN_BIG
 #       else
-#           error EPICS hasnt been ported to <sys/param.h> specified FLOAT_WORD_ORDER
+#           error EPICS has not been ported to <sys/param.h> specified FLOAT_WORD_ORDER
 #       endif
 #   else
         /* assume that if neither __FLOAT_WORD_ORDER nor FLOAT_WORD_ORDER are
diff --git a/modules/libcom/src/osi/os/default/osdWireFormat.h b/modules/libcom/src/osi/os/default/osdWireFormat.h
index 680b491c6..9fb45d4ff 100644
--- a/modules/libcom/src/osi/os/default/osdWireFormat.h
+++ b/modules/libcom/src/osi/os/default/osdWireFormat.h
@@ -56,7 +56,7 @@ inline void WireGet < epicsFloat64 > (
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     union {
         epicsFloat64 _f;
         epicsUInt32 _u[2];
@@ -94,7 +94,7 @@ inline void WireSet < epicsFloat64 > (
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     union {
         epicsFloat64 _f;
         epicsUInt32 _u[2];
@@ -158,7 +158,7 @@ inline void AlignedWireGet < epicsFloat64 > (
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     union Swapper {
         epicsUInt32 _u[2];
         epicsFloat64 _f;
@@ -214,7 +214,7 @@ inline void AlignedWireSet < epicsFloat64 > (
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     union Swapper {
         epicsUInt32 _u[2];
         epicsFloat64 _f;
diff --git a/modules/libcom/src/osi/os/posix/osdThread.c b/modules/libcom/src/osi/os/posix/osdThread.c
index 50eb911e1..c31418d66 100644
--- a/modules/libcom/src/osi/os/posix/osdThread.c
+++ b/modules/libcom/src/osi/os/posix/osdThread.c
@@ -121,7 +121,7 @@ if((status))  {\
 if(status) { \
     fprintf(stderr,"%s  error %s",(message),strerror((status))); \
     fprintf(stderr," %s\n",method); \
-    fprintf(stderr,"epicsThreadInit cant proceed. Program exiting\n"); \
+    fprintf(stderr,"epicsThreadInit can't proceed. Program exiting\n"); \
     exit(-1);\
 }
 
diff --git a/modules/libcom/src/osi/os/solaris/osdWireConfig.h b/modules/libcom/src/osi/os/solaris/osdWireConfig.h
index 1641fb183..b48629232 100644
--- a/modules/libcom/src/osi/os/solaris/osdWireConfig.h
+++ b/modules/libcom/src/osi/os/solaris/osdWireConfig.h
@@ -22,10 +22,10 @@
 #elif defined ( _BIG_ENDIAN )
 #   define EPICS_BYTE_ORDER EPICS_ENDIAN_BIG
 #else
-#   error EPICS hasnt been ported to byte order specified by <sys/isa_defs.h> on Solaris
+#   error EPICS has not been ported to byte order specified by <sys/isa_defs.h> on Solaris
 #endif
 
-/* for now, assume that Solaris doesnt run on weird arch like ARM NWFP */
+/* for now, assume that Solaris doesn't run on weird arch like ARM NWFP */
 #define EPICS_FLOAT_WORD_ORDER EPICS_BYTE_ORDER
 
 #endif /* ifdef osdWireConfig_h */
diff --git a/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c b/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c
index b2fbbdf9a..aeb6f84ac 100644
--- a/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c
+++ b/modules/libcom/src/osi/os/vxWorks/devLibVMEOSD.c
@@ -406,7 +406,7 @@ static int vxDevInterruptInUseVME (unsigned vectorNumber)
         psub = isrFetch (vectorNumber);
 
         /*
-         * its a C routine. Does it match a default handler?
+         * it's a C routine. Does it match a default handler?
          */
         for (i=0; i<NELEMENTS(defaultHandlerAddr); i++) {
             if (defaultHandlerAddr[i] == psub) {
diff --git a/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h b/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h
index 53f69de9f..9beb60f7c 100644
--- a/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h
+++ b/modules/libcom/src/osi/os/vxWorks/epicsAtomicOSD.h
@@ -87,8 +87,8 @@ EPICS_ATOMIC_INLINE void epicsAtomicWriteMemoryBarrier (void)
  * is the same as UINT_MAX then sizeof ( atomic_t )
  * will be the same as sizeof ( size_t )
  *
- * if ULONG_MAX != UINT_MAX then its 64 bit vxWorks and
- * WRS doesnt not supply at this time the atomic interface
+ * if ULONG_MAX != UINT_MAX then it's 64 bit vxWorks and
+ * WRS does not supply at this time the atomic interface
  * for 8 byte integers that is needed - so that architecture
  * receives the lock synchronized version
  */
@@ -153,7 +153,7 @@ EPICS_ATOMIC_INLINE size_t epicsAtomicSubSizeT ( size_t * pTarget, size_t delta
 #else /* ULONG_MAX == UINT_MAX */
 
 /*
- * if its 64 bit SMP vxWorks and the compiler doesnt
+ * if it's 64 bit SMP vxWorks and the compiler doesn't
  * have an intrinsic then maybe there isn't any way to
  * implement these without using a global lock because
  * size_t is maybe bigger than atomic_t
diff --git a/modules/libcom/src/osi/os/vxWorks/osdReadline.c b/modules/libcom/src/osi/os/vxWorks/osdReadline.c
index 24d46f131..9fcd06b52 100644
--- a/modules/libcom/src/osi/os/vxWorks/osdReadline.c
+++ b/modules/libcom/src/osi/os/vxWorks/osdReadline.c
@@ -51,7 +51,7 @@ osdReadlineBegin(struct readlineContext *context)
             if (osd->ledId == (LED_ID) ERROR) {
                 context->in = stdin;
                 printf("Warning -- Unabled to allocate space for command-line history.\n");
-                printf("Warning -- Command-line editting disabled.\n");
+                printf("Warning -- Command-line editing disabled.\n");
             }
         }
         context->osd = osd;
diff --git a/modules/libcom/src/osi/os/vxWorks/osdWireConfig.h b/modules/libcom/src/osi/os/vxWorks/osdWireConfig.h
index 82e323705..1778db23d 100644
--- a/modules/libcom/src/osi/os/vxWorks/osdWireConfig.h
+++ b/modules/libcom/src/osi/os/vxWorks/osdWireConfig.h
@@ -23,10 +23,10 @@
 #elif _BYTE_ORDER == _BIG_ENDIAN
 #   define EPICS_BYTE_ORDER EPICS_ENDIAN_BIG
 #else
-#   error EPICS hasnt been ported to _BYTE_ORDER specified by vxWorks <types/vxArch.h>
+#   error EPICS has not been ported to _BYTE_ORDER specified by vxWorks <types/vxArch.h>
 #endif
 
-/* for now, assume that vxWorks doesnt run on weird arch like ARM NWFP */
+/* for now, assume that vxWorks doesn't run on weird arch like ARM NWFP */
 #define EPICS_FLOAT_WORD_ORDER EPICS_BYTE_ORDER
 
 #endif /* ifdef osdWireConfig_h */
diff --git a/modules/libcom/src/osi/osdNetIfAddrs.c b/modules/libcom/src/osi/osdNetIfAddrs.c
index 293d9ef85..3f74fdea4 100644
--- a/modules/libcom/src/osi/osdNetIfAddrs.c
+++ b/modules/libcom/src/osi/osdNetIfAddrs.c
@@ -70,7 +70,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
             ifa->ifa_name));
 
         /*
-         * If its not an internet interface then don't use it
+         * If it's not an internet interface then don't use it
          */
         if ( ifa->ifa_addr->sa_family != AF_INET ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): interface \"%s\" was not AF_INET\n", ifa->ifa_name) );
@@ -88,7 +88,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
             if ( pMatchAddr->ia.sin_addr.s_addr != htonl (INADDR_ANY) ) {
                  struct sockaddr_in *pInetAddr = (struct sockaddr_in *) ifa->ifa_addr;
                  if ( pInetAddr->sin_addr.s_addr != pMatchAddr->ia.sin_addr.s_addr ) {
-                     ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): net intf \"%s\" didnt match\n", ifa->ifa_name) );
+                     ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): net intf \"%s\" didn't match\n", ifa->ifa_name) );
                      continue;
                  }
             }
diff --git a/modules/libcom/src/osi/osdNetIfConf.c b/modules/libcom/src/osi/osdNetIfConf.c
index 029ed385e..7790883e1 100644
--- a/modules/libcom/src/osi/osdNetIfConf.c
+++ b/modules/libcom/src/osi/osdNetIfConf.c
@@ -135,7 +135,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
             (unsigned)current_ifreqsize));
 
         /*
-         * If its not an internet interface then don't use it
+         * If it's not an internet interface then don't use it
          */
         if ( pIfreqList->ifr_addr.sa_family != AF_INET ) {
              ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): interface \"%s\" was not AF_INET\n", pIfreqList->ifr_name) );
@@ -153,7 +153,7 @@ LIBCOM_API void epicsStdCall osiSockDiscoverBroadcastAddresses
             if ( pMatchAddr->ia.sin_addr.s_addr != htonl (INADDR_ANY) ) {
                  struct sockaddr_in *pInetAddr = (struct sockaddr_in *) &pIfreqList->ifr_addr;
                  if ( pInetAddr->sin_addr.s_addr != pMatchAddr->ia.sin_addr.s_addr ) {
-                     ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): net intf \"%s\" didnt match\n", pIfreqList->ifr_name) );
+                     ifDepenDebugPrintf ( ("osiSockDiscoverBroadcastAddresses(): net intf \"%s\" didn't match\n", pIfreqList->ifr_name) );
                      continue;
                  }
             }
diff --git a/modules/libcom/src/osi/osiClockTime.c b/modules/libcom/src/osi/osiClockTime.c
index 76a705411..251f285f2 100644
--- a/modules/libcom/src/osi/osiClockTime.c
+++ b/modules/libcom/src/osi/osiClockTime.c
@@ -60,7 +60,7 @@ static const iocshArg * const InitArgs[1] = { &InitArg0 };
 static const iocshFuncDef InitFuncDef = {
     "ClockTime_Init", 1, InitArgs,
     "Starts or stops the IOC periodically synchronizing the OS clock\n"
-    "with the higest priority working time provider.\n"};
+    "with the highest priority working time provider.\n"};
 static void InitCallFunc(const iocshArgBuf *args)
 {
     ClockTime_Init(args[0].ival);
diff --git a/modules/libcom/src/osi/osiNTPTime.c b/modules/libcom/src/osi/osiNTPTime.c
index 08ba6ede0..44dbcdfa1 100644
--- a/modules/libcom/src/osi/osiNTPTime.c
+++ b/modules/libcom/src/osi/osiNTPTime.c
@@ -279,7 +279,7 @@ int NTPTime_Report(int level)
 
             epicsTimeToStrftime(lastSync, sizeof(lastSync),
                 "%Y-%m-%d %H:%M:%S.%06f", &NTPTimePvt.syncTime);
-            printf("Syncronization interval = %.1f seconds\n",
+            printf("Synchronization interval = %.1f seconds\n",
                 NTPTimeSyncInterval);
             printf("Last synchronized at %s\n",
                 lastSync);
diff --git a/modules/libcom/src/osi/osiSock.h b/modules/libcom/src/osi/osiSock.h
index e1abb23db..6145634f8 100644
--- a/modules/libcom/src/osi/osiSock.h
+++ b/modules/libcom/src/osi/osiSock.h
@@ -114,7 +114,7 @@ LIBCOM_API void epicsStdCall
  *
  * This enum specifies how to interrupt a blocking socket system call.
  * Fortunately, on most systems the combination of a shutdown of both directions
- * and/or a signal is sufficent to interrupt a blocking send, receive, or
+ * and/or a signal is sufficient to interrupt a blocking send, receive, or
  * connect call. For odd ball systems this is stubbed out in the osi area.
  *
  */
@@ -235,7 +235,7 @@ LIBCOM_API unsigned epicsStdCall ipAddrToDottedIP (
  * \param[out] pBuf Pointer to a character buffer where the output string will be placed
  * \param bufSize Size of the array pointed to by pBuf
  * \return the number of character elements stored in buffer not including the
- * null termination. This will be zero if a matching host name cant be found.
+ * null termination. This will be zero if a matching host name can't be found.
  */
 LIBCOM_API unsigned epicsStdCall ipAddrToHostName (
     const struct in_addr * pAddr, char * pBuf, unsigned bufSize );
diff --git a/modules/libcom/src/osi/osiWireFormat.h b/modules/libcom/src/osi/osiWireFormat.h
index b268b8e3e..c859deced 100644
--- a/modules/libcom/src/osi/osiWireFormat.h
+++ b/modules/libcom/src/osi/osiWireFormat.h
@@ -161,7 +161,7 @@ inline void WireGet ( const epicsUInt8 * pWireSrc, T & dst )
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     WireAlias < T > tmp;
     WireGet ( pWireSrc, tmp._u );
     dst = tmp._o;
@@ -198,7 +198,7 @@ inline void WireSet ( const T & src, epicsUInt8 * pWireDst )
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     WireAlias < T > tmp;
     tmp._o = src;
     WireSet ( tmp._u, pWireDst );
@@ -234,7 +234,7 @@ inline void AlignedWireGet ( const T & src, T & dst )
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     WireAlias < T > srcu, dstu;
     srcu._o = src;
     AlignedWireGet ( srcu._u, dstu._u );
@@ -246,7 +246,7 @@ inline void AlignedWireSet ( const T & src, T & dst )
 {
     // copy through union here
     // a) prevents over-aggressive optimization under strict aliasing rules
-    // b) doesnt preclude extra copy operation being optimized away
+    // b) doesn't preclude extra copy operation being optimized away
     WireAlias < T > srcu, dstu;
     srcu._o = src;
     AlignedWireSet ( srcu._u, dstu._u );
diff --git a/modules/libcom/src/timer/timerQueue.cpp b/modules/libcom/src/timer/timerQueue.cpp
index 62427a64e..d16e6b903 100644
--- a/modules/libcom/src/timer/timerQueue.cpp
+++ b/modules/libcom/src/timer/timerQueue.cpp
@@ -148,7 +148,7 @@ double timerQueue::process ( const epicsTime & currentTime )
         }
 
         //
-        // only restart if they didnt cancel() the timer
+        // only restart if they didn't cancel() the timer
         // while the call back was running
         //
         if ( this->cancelPending ) {
diff --git a/modules/libcom/src/yacc/EPICS_READ_THIS b/modules/libcom/src/yacc/EPICS_READ_THIS
index c6869244a..82e6522dc 100644
--- a/modules/libcom/src/yacc/EPICS_READ_THIS
+++ b/modules/libcom/src/yacc/EPICS_READ_THIS
@@ -41,7 +41,7 @@ static int yyerror(char *str)
 The FirstFlag and yyrestart jazz is the flex-flavored version of how you
 restart the scanner if you want to parse another file.  Without it, the
 scanner can only be used one time.  Even if you think your code will only
-be used one time, it is desireable to put in the restart stuff anyway,
+be used one time, it is desirable to put in the restart stuff anyway,
 because some day you (or your boss) will change your mind and without it
 the IOC will crash when you make your second call to your parser.
 
diff --git a/modules/libcom/src/yacc/NEW_FEATURES b/modules/libcom/src/yacc/NEW_FEATURES
index b030c625b..652f9d58a 100644
--- a/modules/libcom/src/yacc/NEW_FEATURES
+++ b/modules/libcom/src/yacc/NEW_FEATURES
@@ -35,7 +35,7 @@ is
 
 	  %ident string
 
-where string is a sequence of characters begining with a double quote
+where string is a sequence of characters beginning with a double quote
 and ending with either a double quote or the next end-of-line, whichever
 comes first.  The declaration will cause a #ident directive to be written
 near the start of the output file.
diff --git a/modules/libcom/src/yajl/yajl_lex.c b/modules/libcom/src/yajl/yajl_lex.c
index f79291cb6..440e452f5 100644
--- a/modules/libcom/src/yajl/yajl_lex.c
+++ b/modules/libcom/src/yajl/yajl_lex.c
@@ -389,7 +389,7 @@ yajl_lex_string(yajl_lexer lexer, const unsigned char * jsonText,
         /* accept it, and move on */
     }
   finish_string_lex:
-    /* tell our buddy, the parser, wether he needs to process this string
+    /* tell our buddy, the parser, whether he needs to process this string
      * again */
     if (hasEscapes && tok == yajl_tok_string) {
         tok = yajl_tok_string_with_escapes;
diff --git a/modules/libcom/src/yajl/yajl_parse.h b/modules/libcom/src/yajl/yajl_parse.h
index c7240f4e4..2e5c2e34c 100644
--- a/modules/libcom/src/yajl/yajl_parse.h
+++ b/modules/libcom/src/yajl/yajl_parse.h
@@ -34,7 +34,7 @@ extern "C" {
         yajl_status_ok,
         /** A client callback returned zero, stopping the parse. */
         yajl_status_client_canceled,
-        /** An error occured during the parse. Call yajl_get_error() for
+        /** An error occurred during the parse. Call yajl_get_error() for
          *  more information about the encountered error. */
         yajl_status_error
     } yajl_status;
@@ -229,7 +229,7 @@ extern "C" {
     /** Get an error string describing the state of the parse.
      *
      *  If verbose is non-zero, the message will include the JSON text where
-     *  the error occured, along with an arrow pointing to the specific char.
+     *  the error occurred, along with an arrow pointing to the specific char.
      *
      *  \returns A dynamically allocated string will be returned which should
      *  be freed with yajl_free_error().
@@ -246,7 +246,7 @@ extern "C" {
      *
      * In the event an error is encountered during parsing, this function
      * affords the client a way to get the offset into the most recent
-     * chunk where the error occured.  0 will be returned if no error
+     * chunk where the error occurred.  0 will be returned if no error
      * was encountered.
      */
     YAJL_API size_t yajl_get_bytes_consumed(yajl_handle hand);
diff --git a/modules/libcom/test/epicsAtomicPerform.cpp b/modules/libcom/test/epicsAtomicPerform.cpp
index a56f70cfb..f3560cc7c 100644
--- a/modules/libcom/test/epicsAtomicPerform.cpp
+++ b/modules/libcom/test/epicsAtomicPerform.cpp
@@ -237,7 +237,7 @@ private:
 // function and also increment an integer word. The
 // epicsInterruptIsInterruptContext function is an
 // out-of-line function implemented in a shareable library
-// so hopefully it wont be optimized away.
+// so hopefully it won't be optimized away.
 template < class T >
 inline void OrdinaryIncr < T > :: run ()
 {
diff --git a/modules/libcom/test/epicsAtomicTest.cpp b/modules/libcom/test/epicsAtomicTest.cpp
index a7bd31000..d5545226b 100644
--- a/modules/libcom/test/epicsAtomicTest.cpp
+++ b/modules/libcom/test/epicsAtomicTest.cpp
@@ -360,7 +360,7 @@ void testBasic()
     using epics::atomic::subtract;
     using epics::atomic::compareAndSwap;
 
-    testDiag("Test basic operation symantics");
+    testDiag("Test basic operation semantics");
 
     int Int = 0;
     size_t Sizet = 0;
diff --git a/modules/libcom/test/epicsStringTest.c b/modules/libcom/test/epicsStringTest.c
index 18264cbae..be5600b87 100644
--- a/modules/libcom/test/epicsStringTest.c
+++ b/modules/libcom/test/epicsStringTest.c
@@ -224,7 +224,7 @@ void testEpicsStrPrintEscaped(void)
 
     // Failing cases
     testOk1(epicsStrPrintEscaped(NULL, "1234", 4) == -1);
-    // On some platforms (specifially certain versions of MinGW-w64), fprintf
+    // On some platforms (specifically certain versions of MinGW-w64), fprintf
     // is broken and does not return -1 when the write operation fails. On
     // those platforms, epicsStrPrintEscaped cannot detect failure either, so
     // testing that it reports failure does not make sense on those platforms.
diff --git a/modules/libcom/test/epicsThreadPerform.cpp b/modules/libcom/test/epicsThreadPerform.cpp
index 3b7baef2d..f414aaf07 100644
--- a/modules/libcom/test/epicsThreadPerform.cpp
+++ b/modules/libcom/test/epicsThreadPerform.cpp
@@ -119,7 +119,7 @@ static void threadSleepQuantumTest ()
             "The epicsThreadSleepQuantum() call returns %f sec.\n",
                 quantum );
         printf (
-            "This doesnt match the quantum estimate "
+            "This doesn't match the quantum estimate "
             "of %f sec within %s.\n",
                 quantumEstimate, pTol );
     }
diff --git a/modules/libcom/test/yajl_test.c b/modules/libcom/test/yajl_test.c
index be92aecfd..226fb32ec 100644
--- a/modules/libcom/test/yajl_test.c
+++ b/modules/libcom/test/yajl_test.c
@@ -161,7 +161,7 @@ static void usage(const char * progname)
 {
     fprintf(stderr,
             "usage:  %s [options]\n"
-            "Parse input from stdin as JSON and ouput parsing details "
+            "Parse input from stdin as JSON and output parsing details "
                                                           "to stdout\n"
             "   -5  allow JSON5\n"
             "   -b  set the read buffer size\n"
diff --git a/modules/libcom/vxWorks/boost/config/auto_link.hpp b/modules/libcom/vxWorks/boost/config/auto_link.hpp
index e36d06a05..21cab3023 100644
--- a/modules/libcom/vxWorks/boost/config/auto_link.hpp
+++ b/modules/libcom/vxWorks/boost/config/auto_link.hpp
@@ -80,7 +80,7 @@ BOOST_LIB_VERSION:    The Boost version, in the form x_y, for Boost version x.y.
 #  endif
 #elif defined(_MSC_VER) && !defined(__MWERKS__) && !defined(__EDG_VERSION__)
 //
-// C language compatability (no, honestly)
+// C language compatibility (no, honestly)
 //
 #  define BOOST_MSVC _MSC_VER
 #  define BOOST_STRINGIZE(X) BOOST_DO_STRINGIZE(X)
diff --git a/modules/libcom/vxWorks/boost/config/suffix.hpp b/modules/libcom/vxWorks/boost/config/suffix.hpp
index 8ee88d90f..83b167c0b 100644
--- a/modules/libcom/vxWorks/boost/config/suffix.hpp
+++ b/modules/libcom/vxWorks/boost/config/suffix.hpp
@@ -474,7 +474,7 @@ namespace std {
 #endif
 
 // long long workaround ------------------------------------------//
-// On gcc (and maybe other compilers?) long long is alway supported
+// On gcc (and maybe other compilers?) long long is always supported
 // but it's use may generate either warnings (with -ansi), or errors
 // (with -pedantic -ansi) unless it's use is prefixed by __extension__
 //
diff --git a/src/template/base/makeBaseApp.pl b/src/template/base/makeBaseApp.pl
index 7cc9a302e..4fc0b4748 100644
--- a/src/template/base/makeBaseApp.pl
+++ b/src/template/base/makeBaseApp.pl
@@ -31,7 +31,7 @@ GetUser();		# Ensure we know who's in charge
 #
 # Declare two default callback routines for file copy plus two
 # hook routines to add conversions
-# These may be overriden within $top/$apptypename/Replace.pl
+# These may be overridden within $top/$apptypename/Replace.pl
 
 # First: the hooks
 sub ReplaceFilenameHook { return $_[0]; }
diff --git a/src/template/ext/makeBaseExt.pl b/src/template/ext/makeBaseExt.pl
index a097c153a..5b5a1df0a 100644
--- a/src/template/ext/makeBaseExt.pl
+++ b/src/template/ext/makeBaseExt.pl
@@ -25,7 +25,7 @@ $extname = "@ARGV";
 #
 # Declare two default callback routines for file copy plus two
 # hook routines to add conversions
-# These may be overriden within $top/$exttypename/Replace.pl
+# These may be overridden within $top/$exttypename/Replace.pl
 
 # First: the hooks
 sub ReplaceFilenameHook { return $_[0]; }
@@ -93,7 +93,7 @@ foreach $ext ( @ARGV ) {
     ($extname = $ext) =~ s/Ext$//;
     $extdir  = $extname;
     if (-d "src/$extdir") {
-	print "Extention $extname is already there!\n";
+	print "Extension $extname is already there!\n";
 	next;
     }
     print "Creating template structure "
@@ -161,7 +161,7 @@ sub get_commandline_opts { #no args
 	exit 0;			# finished for -l command
     }
 
-# Extention template type
+# Extension template type
     if ($opt_t) { # first choice is -t type
 	$exttype = $opt_t; 
     } elsif ($eEXTTYPE) { # second choice is $ENV{EPICS_DEFAULT_EXT_TYPE}
diff --git a/src/template/ext/top/configure/RELEASE b/src/template/ext/top/configure/RELEASE
index 26ce656cd..97fcba9bd 100644
--- a/src/template/ext/top/configure/RELEASE
+++ b/src/template/ext/top/configure/RELEASE
@@ -4,7 +4,7 @@
 
 # RELEASE Locations of external modules
 #
-# NOTE: The build does not check dependancies on files
+# NOTE: The build does not check dependencies on files
 # external to this application. Thus you should run
 # "gnumake clean uninstall install" in the top directory
 # each time EPICS_BASE or any other external module that
diff --git a/src/tools/EPICS/Getopts.pm b/src/tools/EPICS/Getopts.pm
index f448985d0..9afd8623f 100644
--- a/src/tools/EPICS/Getopts.pm
+++ b/src/tools/EPICS/Getopts.pm
@@ -59,7 +59,7 @@ that an unknown option was given. The getopts() function returns true unless an
 invalid option was found.
 
 Note that, if your code is running under the recommended C<use strict 'vars'>
-pragma, you will need to declare the necesary package variables with "our"
+pragma, you will need to declare the necessary package variables with "our"
 before the call to getopts:
 
     our($opt_v, $opt_o, @opt_I);
diff --git a/src/tools/EPICS/Release.pm b/src/tools/EPICS/Release.pm
index e6aaf1e0c..4d7e569af 100644
--- a/src/tools/EPICS/Release.pm
+++ b/src/tools/EPICS/Release.pm
@@ -10,7 +10,7 @@
 my $MVAR = qr/[A-Za-z_] [A-Za-z_0-9-]*/x;
 
 #
-# Parse all relevent configure/RELEASE* files and includes
+# Parse all relevant configure/RELEASE* files and includes
 #
 sub readReleaseFiles {
     my ($relfile, $Rmacros, $Rapps, $arch) = @_;
diff --git a/src/tools/Pod/Markdown.pm b/src/tools/Pod/Markdown.pm
index 1874f232f..cc52b46a9 100644
--- a/src/tools/Pod/Markdown.pm
+++ b/src/tools/Pod/Markdown.pm
@@ -413,7 +413,7 @@ sub _build_markdown_head {
 # * I don't actually see anything that curly braces are used for.
 # * Escaping square brackets is enough to avoid accidentally
 # creating links and images (so we don't need to escape plain parentheses
-# or exclamation points as that would generate a lot of unnecesary noise).
+# or exclamation points as that would generate a lot of unnecessary noise).
 # Parentheses will be escaped in urls (&end_L) to avoid premature termination.
 # * We don't need a backslash for every hash mark or every hyphen found mid-word,
 # just the ones that start a line (likewise for plus and dot).
@@ -542,7 +542,7 @@ sub _process_escapes {
   # The patterns below are taken from Markdown.pl 1.0.1 _EncodeAmpsAndAngles().
   # In this case we only want to encode the ones that Markdown won't.
   # This is overkill but produces nicer looking text (less escaped entities).
-  # If it proves insufficent then we'll just encode them all.
+  # If it proves insufficient then we'll just encode them all.
 
   # $1: If the escape was in a code sequence, simply replace the original.
   # $2: If the unescaped value would be followed by characters
@@ -1007,8 +1007,8 @@ sub   end_L {
   # Backslash escapes do not work for the space and quotes.
   # URL-encoding the space is not sufficient
   # (the quotes confuse some parsers and produce invalid html).
-  # I've arbitratily chosen HTML encoding to hide them from markdown
-  # while mangling the url as litle as possible.
+  # I've arbitrarily chosen HTML encoding to hide them from markdown
+  # while mangling the url as little as possible.
   $url =~ s/([ '"])/sprintf '&#x%x;', ord($1)/ge;
 
   # We also need to double any backslashes that may be present
diff --git a/src/tools/genVersionHeader.pl b/src/tools/genVersionHeader.pl
index a305619a7..eee0f928c 100644
--- a/src/tools/genVersionHeader.pl
+++ b/src/tools/genVersionHeader.pl
@@ -54,7 +54,7 @@ if (-d '_darcs') { # Darcs
     print "== Found <top>/_darcs directory\n" if $opt_v;
     # v1-4-dirty
     # is tag 'v1' plus 4 patches
-    # with uncommited modifications
+    # with uncommitted modifications
     my @tags = split('\n', `darcs show tags`);
     my $count = `darcs changes --count --from-tag .` - 1;
     my $result = $tags[0] . '-' . $count;
@@ -73,7 +73,7 @@ elsif (-d '.hg') { # Mercurial
     print "== Found <top>/.hg directory\n" if $opt_v;
     # v1-4-abcdef-dirty
     # is 4 commits after tag 'v1' with short hash abcdef
-    # with uncommited modifications
+    # with uncommitted modifications
     my $result = `hg tip --template '{latesttag}-{latesttagdistance}-{node|short}'`;
     print "== hg tip:\n$result\n==\n" if $opt_v;
     if (!$? && $result ne '') {
@@ -90,7 +90,7 @@ elsif (-d '.git' || -f '.git') { # Git
     print "== Found <top>/.git directory\n" if $opt_v;
     # v1-4-abcdef-dirty
     # is 4 commits after tag 'v1' with short hash abcdef
-    # with uncommited modifications
+    # with uncommitted modifications
     my $result = `git describe --always --tags --dirty --abbrev=20`;
     chomp $result;
     print "== git describe:\n$result\n==\n" if $opt_v;
diff --git a/src/tools/makeAPIheader.pl b/src/tools/makeAPIheader.pl
index 297946ff4..11d1a2720 100644
--- a/src/tools/makeAPIheader.pl
+++ b/src/tools/makeAPIheader.pl
@@ -70,7 +70,7 @@ recommended. The old approach is simpler in these cases.
 In a Makefile that is building a DLL or shared library, set the variable
 C<API_HEADER> to the name of the API header file to be generated. This name
 must start with a legal C identifier and end with C<API.h>. The C identifier
-part preceeding the C<API.h> is referred to here as the I<stem> for this
+part preceding the C<API.h> is referred to here as the I<stem> for this
 header file, and should be a short name in lower case or camelCase. For
 example the stem used in the example here is C<libCom>:
 
diff --git a/src/tools/tap-to-junit-xml.pl b/src/tools/tap-to-junit-xml.pl
index 76f9721a3..cbe9ed13b 100644
--- a/src/tools/tap-to-junit-xml.pl
+++ b/src/tools/tap-to-junit-xml.pl
@@ -410,7 +410,7 @@ sub _parse_tests {
       if ($s =~ /(?:not |)\S+ (\d+)/) { $ntest = $1+0; }
 
       if ($ntest > $ctx->{plan_ntests}) {
-        # jump in test numbers, more than planned; this is probably TAP::Parser's wierdness.
+        # jump in test numbers, more than planned; this is probably TAP::Parser's weirdness.
         # (when it sees the "ok" line at the end of a test case with no number,
         # it outputs the current total number of tests so far.)
         next;